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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) | 12 Months Ended
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Dec. 31, 2024
Accounting Policies [Abstract] |
Basis of Presentation | Southwest Airlines Co. (the "Company" or "Southwest") operates Southwest Airlines, a major domestic airline. The Consolidated Financial Statements include the accounts of the Company and its wholly owned subsidiaries. The accompanying Consolidated Financial Statements include the results of operations and cash flows for all periods presented and all significant inter-entity balances and transactions have been eliminated. The preparation of financial statements in conformity with generally accepted accounting principles in the United States ("GAAP") requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from these estimates. In late December 2022, Winter Storm Elliott impacted a significant portion of the United States, leading to wide-scale operational disruptions for the Company. In attempting to recover from this weather event, the Company was challenged in its efforts to realign flight crews, flight schedules, and fleet for a period of days during this peak demand travel period. As a result, the Company canceled a significant number of flights between December 21 and December 29, before ultimately returning to a normal flight schedule on December 30, 2022. These canceled flights resulted in a significant reduction in Passenger revenues during this period and also created a deceleration in bookings, primarily isolated to January and February 2023. In addition, the Company incurred significant costs associated with this event and recorded these expenses during December 2022 and first quarter 2023, totaling approximately $390 million and $55 million, respectively, which are included in the accompanying Consolidated Statement of Income. These estimated items included reimbursements to Customers impacted by the cancellations for costs they incurred, the estimated value of Rapid Rewards points offered as a gesture of goodwill to Customers that are expected to be redeemed, and additional premium pay and additional compensation for Employees directly or indirectly impacted by the cancellations and recovery efforts. The financial impacts of the event to the Company also included lower fuel and oil and profitsharing expenses. Based on the Company's wide-scale operational disruption, the Company could be subject to fines and/or penalties resulting from investigations by government agencies as well as litigation from Customers and Shareholders. On October 27, 2023, the Department of Transportation (the "DOT") notified the Company that it had determined the Company failed to provide adequate Customer Service assistance, prompt flight status notifications, and proper and prompt refunds and that the assessment of a civil penalty was warranted. During fourth quarter 2023, the Company accrued an expense of $107 million associated with a settlement reached with the DOT in December 2023 based on their investigation into the disruption. Other than this December 2023 charge, there were no material impacts to operating revenues or expenses as a result of this disruption beyond first quarter 2023.
Cash and Cash Equivalents | Cash in excess of that necessary for operating requirements is invested in short-term, highly liquid, income-producing investments. Investments with original maturities of three months or less when purchased are classified as cash and cash equivalents, which primarily consist of certificates of deposit, money market funds, and investment grade commercial paper issued by major corporations and financial institutions. Cash and cash equivalents are stated at cost, which approximates fair value. As of December 31, 2024 and 2023, $22 million and $50 million, respectively, in cash collateral deposits were held by the Company from its fuel hedge counterparties. As of December 31, 2024 and 2023, the Company had no outstanding interest rate swap agreements and therefore no cash collateral deposits were provided by or held by the Company from interest rate hedge counterparties. Cash collateral amounts provided or held associated with fuel derivative instruments are not restricted in any way and earn interest income at an agreed upon rate that approximates the rates earned on short-term securities issued by the U.S. Government. Depending on the fair value of the Company’s fuel derivative instruments, the amounts of collateral deposits held or provided at any point in time can fluctuate significantly.
Short-term and Noncurrent Investments | Short-term investments consist of investments with original maturities of greater than three months but less than twelve months when purchased. These are primarily short-term securities issued by the U.S. Government and certificates of deposit issued by domestic banks. All of these investments are classified as available-for-sale securities and are stated at fair value, which approximates cost. For all short-term investments, at each reset period or upon reinvestment, the Company accounts for the transaction as Proceeds from sales of short-term and other investments for the security relinquished, and Purchases of short-term investments for the security purchased, in the accompanying Consolidated Statement of Cash Flows. Unrealized gains and losses, net of tax, if any, are recognized in Accumulated other comprehensive income (loss) ("AOCI") in the accompanying Consolidated Balance Sheet. Realized net gains and losses on specific investments, if any, are reflected in Interest income in the accompanying Consolidated Statement of Income. Both unrealized and realized gains and/or losses associated with investments were immaterial for all years presented. Noncurrent investments consist of investments with maturities of greater than twelve months. Noncurrent investments are included as a component of Other assets in the Consolidated Balance Sheet.
Accounts and Other Receivables | Accounts and other receivables are initially recorded at cost and are evaluated for collectability in every period. They primarily consist of the amounts due from the credit card companies associated with sales of tickets for future travel, amounts due from business partners in the Company’s loyalty program, and tax receivables from overpayment or net operating losses that are allowed to be carried back to prior periods to claim refunds against prior taxes paid.
Inventories | Inventories primarily consist of aircraft fuel and flight equipment expendable parts, materials, and supplies. All of these items are carried at average cost, less an allowance for obsolescence. These items are generally charged to expense when issued for use.
Property and Equipment | Property and equipment is stated at cost. Capital expenditures include payments made for aircraft, other flight equipment, purchase deposits related to future aircraft deliveries, airport and other facility construction projects, and ground and other property and equipment. Depreciation is provided by the straight-line method to estimated residual values over periods of approximately 25 years for flight equipment, and 5 to 30 years for ground property and equipment. As of December 31, 2024, residual values estimated for aircraft range from 14 percent to 20 percent, and generally range from 0 to 10 percent for ground property and equipment. Assets constructed for others consists of airport improvement projects in which the Company is considered to have control of the asset during the construction period. Once construction is effectively completed, the sale-leaseback model would apply when control passes from the lessee to the lessor. See Note 4 for further information. Leasehold improvements are amortized as a component of depreciation expense over the estimated useful life of the asset or the remaining term of the underlying lease, whichever is less. In certain situations, the term of the lease may include periods covered by renewal options, if renewal is reasonably certain. The Company evaluates its long-lived assets used in operations for impairment when events and circumstances indicate that the undiscounted cash flows to be generated by that asset group are less than the carrying amounts of the asset group and may not be recoverable. Factors that would indicate potential impairment include, but are not limited to, significant decreases in the market value of the long-lived asset group, a significant change in the long-lived asset group’s physical condition, and operating or cash flow losses associated with the use of the long-lived asset group. If an asset group is deemed to be impaired, an impairment loss is recorded for the excess of the asset group's book value in relation to its estimated fair value.
Leases | The Company determines if an arrangement is a lease at inception. Operating leases are included in Operating lease right-of-use assets, Current operating lease liabilities, and Noncurrent operating lease liabilities in the Consolidated Balance Sheet. Finance leases are included in Property and equipment, Current maturities of long-term debt, and Long-term debt less current maturities in the Consolidated Balance Sheet. Right-of-use assets represent the Company's right to use an underlying asset for the lease term, and lease liabilities represent the Company's obligation to make lease payments arising from the lease. The lease liability is measured as the present value of the unpaid lease payments, and the right-of-use asset value is derived from the calculation of the lease liability. Lease payments include fixed and in-substance fixed payments, variable payments based on an index or rate, reasonably certain purchase options, termination penalties, fees paid by the lessee to the owners of a special-purpose entity for restructuring the transaction, and probable amounts the lessee will owe under a residual value guarantee. Lease payments do not include (i) variable lease payments other than those that depend on an index or rate, (ii) any guarantee by the lessee of the lessor’s debt, or (iii) any amount allocated to non-lease components, if such election was made upon adoption, per the provisions of the Accounting Standards Codification ("ASC") 842. The Company uses its estimated incremental borrowing rate, which is derived from information available at the lease commencement date, in determining the present value of lease payments, since the Company does not know the actual implicit rates in its leases. The Company gives consideration to its most recent debt issuances as well as publicly available data for instruments with similar characteristics when calculating its incremental borrowing rate. Lease expense for operating lease payments is recognized on a straight-line basis over the lease term. The Company combines lease and non-lease components for all asset groups. The lease term includes any option to extend the lease when it is reasonably certain to be exercised based on considering all relevant economic factors. The Company enters into leases for aircraft, property, and other types of equipment in the normal course of business. As allowed under ASC 842, Leases, the Company has elected a practical expedient to exclude from recognition lease assets and lease liabilities associated with leases that have an initial term of twelve months or less. Such expense was not material for the twelve months ended December 31, 2024, 2023, and 2022.
Aircraft and Engine Maintenance | The cost of scheduled inspections and repairs and routine maintenance costs for all aircraft and engines are charged to Maintenance materials and repairs expense within the accompanying Consolidated Statement of Income as incurred. The Company has maintenance agreements related to certain aircraft engines with external service providers, including agreements that effectively transfer the risk of performance of such work to the service provider. Under the agreements where the risk of performance is deemed transferred to the counterparty, expense is recorded commensurate with the period in which the corresponding level of service is provided. For its engine maintenance contracts that do not transfer risk to the service provider, the Company records expense on a time and materials basis when an engine repair event takes place. Modifications that significantly enhance the operating performance or extend the useful lives of aircraft or engines are capitalized and amortized over the remaining life of the asset.
Goodwill and Intangible Assets | The Company applies a fair value-based impairment test to the carrying value of goodwill and indefinite-lived intangible assets annually on October 1st, or more frequently if certain events or circumstances indicate that an impairment loss may have been incurred. The Company assesses the value of goodwill and indefinite-lived intangible assets under either a qualitative or quantitative approach. Under a qualitative approach, the Company considers various market factors, including applicable key assumptions also used in the quantitative assessment listed below. These factors are analyzed to determine if events and circumstances could reasonably have affected the fair value of goodwill and indefinite-lived intangible assets. If the Company determines that it is more likely than not that an indefinite-lived intangible asset or reporting unit goodwill is impaired, the quantitative approach is used to assess the asset or reporting unit fair value and the amount of the impairment. Under a quantitative approach, the fair value of the Company's indefinite-lived intangible asset or reporting unit is calculated based on key market participant assumptions. If the indefinite-lived intangible assets' carrying value exceeds the fair value calculated using the quantitative approach, an impairment charge is recorded for the difference in fair value and carrying value. If the reporting unit carrying value exceeds the reporting unit fair value calculated using the quantitative approach, an impairment charge is recorded for the difference between fair value and carrying value, limited to the amount of goodwill in the reporting unit. The Company’s intangible assets primarily consist of acquired rights to certain airport owned takeoff and landing slots (a "slot" is the right of an air carrier, pursuant to regulations of the Federal Aviation Administration ("FAA"), to operate a takeoff or landing at a specific time at certain airports) at certain domestic slot-controlled airports. Indefinite-lived slots of $296 million are included as a component of Other assets in the Company's Consolidated Balance Sheet, as of December 31, 2024 and 2023. The Company applied the qualitative approach during its 2024 impairment tests, and no impairment was determined to exist for Goodwill or indefinite-lived intangible assets.
Revenue Recognition | Tickets sold for Passenger air travel are initially deferred as Air traffic liability. Passenger revenue is recognized and Air traffic liability is reduced when the service is provided (i.e., when the flight takes place). Air traffic liability primarily represents tickets sold for future travel dates, flight credits that are expected to be used in the future, and loyalty benefits that are expected to be redeemed in the future. The majority of the Company’s tickets sold are nonrefundable. Southwest has a No-Show policy that applies to fares that are not canceled or changed by a Customer at least ten minutes prior to a flight's scheduled departure. Nonrefundable tickets that are sold but not flown on the travel date, and are canceled in accordance with the No-Show policy, can be applied to future travel. Refundable tickets that are sold but not flown on the travel date can also be applied to future travel. A small percentage of tickets (or partial tickets) will go unused, which is sometimes referred to as breakage. The Company estimates the amount of tickets that will go unused and recognizes such amounts in Passenger revenue in proportion to the pattern of flights taken by the Customers, once the flight date has lapsed. Based on the Company's revenue recognition policy, revenue is recorded at the flight date for a Customer who does not change his/her itinerary or does not cancel in accordance with the No-Show policy as the Company has then fulfilled its performance obligation. Amounts collected from passengers for ancillary services are also recognized when the service is provided, which is typically the flight date. During 2020 and in parts of 2021, the Company experienced a significantly higher number of Customer-driven flight cancellations as a result of the COVID-19 pandemic. For all Customer flight credits created or that would have otherwise expired between March 1 and September 7, 2020, the Company previously extended the expiration date to September 7, 2022. On July 28, 2022, the Company modified its policy and announced that all unexpired flight credits as of that date, including flight credits previously extended as a result of the COVID-19 pandemic, no longer have an expiration date and thus will be able to be redeemed by Customers indefinitely. This change in policy was considered a contract modification under ASC 606, and the Company accounted for such change prospectively in third quarter 2022. Due to customer redemptions of these pre-policy change flight credits that were issued to Customers during 2022 and prior at a higher than projected rate throughout 2024, as well as currently projected redemptions beyond 2024, the Company determined that a reversal of a portion of prior recorded breakage revenue was warranted. This change in breakage revenue, and the corresponding impact to Passenger revenue, is considered a change in estimate and resulted in the following impact to 2024 results:
|  | Year ended December 31,
(in millions, except per share amounts) |  | 2024
Breakage revenue adjustment |  | $ | (116) |
Net income * |  | (76) |
Net income per basic share |  | (0.13) |
Net income per diluted share |  | (0.12) |
* net of profitsharing benefit and income taxes Breakage estimates are based on the Company's Customers' historical travel behavior as well as assumptions about their future travel behavior. Assumptions about the Customers' future travel behavior can be impacted by several factors including, but not limited to: fare increases; fare sales; changes to the Company's ticketing policies; changes to the Company’s refund, exchange, and unused flight credit policies; seat availability; and economic factors. As a result of the Company's policy change for flight credits in 2022, as well as changes in Customer behavior during 2020 and 2021, the amount of breakage realized on a long term prospective basis has been and is expected to continue to be lower and more stable than it had been previously. See Note 5 for further information. In order to determine the value of each loyalty point, certain assumptions must be made at the time of measurement, which include the following: •Allocation of Passenger Revenue - Revenues from Passengers, related to travel, who also earn Rapid Rewards Points have been allocated between flight (recognized as revenue when transportation is provided) and Rapid Rewards Points (deferred until points are redeemed) based on each obligation’s relative standalone selling price. The Company utilizes historical earning patterns to assist in this allocation. •Fair Value of Rapid Rewards Points - Determined from the base fare value of tickets which were purchased using prior point redemptions for travel and other products and services, which the Company believes to be indicative of the fair value of points as perceived by Customers and representative of the value of each point at the time of redemption. The Company’s booking site allows a Customer to toggle between fares utilizing either cash (or equivalent) or point redemptions, which provides the Customer with an approximation of the equivalent value of their points. The value can differ, however, based on demand, the amount of time prior to the flight, and other factors. The mix of fare classes during the period measured represents a constraint, which could result in the assumptions above changing at the measurement date, as fare classes can have different coefficients used to determine the total loyalty points needed to purchase an award ticket. The mixture of these fare classes and changes in the coefficients used by the Company could cause the fair value per point to fluctuate. For points that are expected to remain unused, the Company recognizes breakage in proportion to the pattern of points used by the Customer, which approximates the average period over which the population of Rapid Reward Members redeem their points. The Company utilizes historical behavioral data to develop a predictive statistical model to analyze the amount of breakage expected for points sold to business partners and earned through flight. The Company continues to evaluate expected breakage annually and applies appropriate adjustments in the fourth quarter of each year, or other times, if significant changes in Customer behavior are detected. Changes to breakage estimates impact revenue recognition prospectively. Due to the size of the Company’s liability for loyalty benefits, changes in Customer behavior and/or expected future redemption patterns could result in significant variations in Passenger revenue. The Company allocates consideration received to performance obligations based on the relative fair value of those obligations. The Company maintains a decades-long relationship with and has a co-branded credit card agreement (“Agreement”) with Chase, through which the Company sells loyalty points and certain marketing components, which consist of the use of the Southwest Airlines brand and access to Rapid Rewards Member lists, licensing and advertising elements, and the use of the Company’s resource team. The Company estimates the selling prices and volumes over the term of the Agreement in order to determine the allocation of proceeds to each of the two performance obligations identified in the Agreement, which have been characterized as a transportation component and a marketing component. The allocations utilized are reviewed to determine if adjustment is necessary any time there is a modification to the Agreement. The Company records Passenger revenue related to loyalty point redemptions for air travel when the travel is delivered, and the marketing elements are recognized as Other revenue when the performance obligations related to those services are satisfied, which is generally the same period consideration is received from Chase. As performance obligations to Customers are satisfied, the related revenue is recognized. The events that result in revenue recognition that are associated with performance obligations identified as a part of the Rapid Rewards Program are as follows: •Tickets and Rapid Rewards Points - When a flight occurs, the related performance obligation is satisfied and the related value provided by the Customer, whether from purchased tickets, Rapid Rewards Points, or a combination thereof, is recognized as revenue. •Loyalty points redeemed for goods and/or services other than travel - Rapid Rewards Members have the option to redeem points for goods and services offered through a third party vendor, who acts as principal. The performance obligation related to the purchase of these goods and services is satisfied when the good and/or service is delivered to the Customer. •Marketing Royalties - As part of its Agreement with Chase, Southwest provides certain deliverables, including use of the Southwest Airlines’ brand, access to Rapid Rewards Member lists, advertising elements, and the Company’s resource team. These performance obligations are satisfied each month that the Agreement is active. All performance obligations related to freight services sold are completed within twelve months or less; therefore, the Company has elected to not disclose the amount of the remaining transaction price and its expected timing of recognition for freight shipments. Other revenues primarily consist of marketing royalties associated with the Company’s co-brand Chase® Visa credit card program, but also include commissions and advertising associated with Southwest.com. All amounts classified as Other revenues are paid monthly, coinciding with the Company fulfilling its deliverables; therefore, the Company has elected to not disclose the amount of the remaining transaction price and its expected timing of recognition for such services provided. The Company is also required to collect certain taxes and fees from Customers on behalf of government agencies and remit these back to the applicable governmental entity on a periodic basis. These taxes and fees include foreign and U.S. federal transportation taxes, federal security charges, and airport passenger facility charges. These items are collected from Customers at the time they purchase their tickets, are excluded from the contract transaction price, and are therefore not included in Passenger revenue. The Company records a liability upon collection from the Customer and relieves the liability when payments are remitted to the applicable governmental agency.
Loyalty Program | The Company records a liability for the relative fair value of providing free travel under its loyalty program for all points earned from flight activity or sold to business partners participating in the Company’s Rapid Rewards loyalty program. The loyalty liability represents performance obligations that will be satisfied when a Rapid Rewards loyalty member redeems points for travel or other goods and services. Points earned from flight activity are valued at their relative standalone selling price by applying fair value based on historical redemption patterns. Points earned from business partner activity, which primarily consist of points sold, along with related marketing services, to companies participating in the Rapid Rewards loyalty program, are valued using a relative fair value methodology based on the contractual rate which partners pay to Southwest to award Rapid Rewards points to the business partner’s customers. For points that are expected to remain unused, the Company recognizes breakage in proportion to the pattern of points used by the Customer, which approximates the average period over which the population of Rapid Reward Members redeem their points. The Company records passenger revenue related to air transportation when the transportation is delivered. The marketing elements are recognized as Other - net revenue when earned. The Company’s liability for loyalty benefits includes a portion that is expected to be redeemed during the following twelve months (classified as a component of Air traffic liability), and a portion that is not expected to be redeemed during the following twelve months (classified as Air traffic liability - noncurrent). The Company continually updates this analysis and adjusts the split between current and non-current liabilities as appropriate. See Note 5 for further information.
Advertising | Advertising costs are charged to expense as incurred.
Share-based Employee Compensation | The Company has share-based compensation plans covering certain Employees, including a plan that also covers the Company’s Board of Directors. The Company accounts for share-based compensation based on its grant date fair value. See Note 9 for further information. The Company accounts for share-based compensation utilizing fair value, which is determined on the date of grant for all instruments. Grants of RSUs result in the creation of a deferred tax asset, which is a temporary difference, until the time the RSU vests. All excess tax benefits and tax deficiencies are recorded through the Consolidated Statement of Income. Due to the treatment of RSUs for tax purposes, the Company’s effective tax rate from year to year is subject to variability.
Financial Derivative Instruments | The Company accounts for financial derivative instruments at fair value and applies hedge accounting rules where appropriate. The Company utilizes various derivative instruments, including jet fuel, crude oil, unleaded gasoline, and heating oil-based derivatives, in an attempt to reduce the risk of its exposure to jet fuel price increases. These instruments are accounted for as cash flow hedges upon proper qualification. At times, the Company can have interest rate swap agreements, the primary objective of which is to hedge forecasted debt issuances. These interest rate hedges are appropriately designated as cash flow hedges. Since the majority of the Company’s financial derivative instruments are not traded on a market exchange, the Company estimates their fair values. Depending on the type of instrument, the values are determined by the use of present value methods or option value models with assumptions about commodity prices based on those observed in underlying markets. All cash flows associated with purchasing and selling derivatives are classified as operating cash flows in the Consolidated Statement of Cash Flows, within Changes in certain assets and liabilities. The Company classifies its cash collateral provided to or held from counterparties in a "net" presentation on the Consolidated Balance Sheet against the fair value of the derivative positions with those counterparties. See Note 10 for further information. Accounting standards pertaining to fair value measurements establish a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. As of December 31, 2024, the Company held certain items that are required to be measured at fair value on a recurring basis. These included cash equivalents, short-term investments (primarily treasury bills), fuel derivative contracts, and available-for-sale securities. The majority of the Company’s cash equivalents and short-term investments consist of instruments classified as Level 1. However, the Company has certificates of deposit and time deposits that are classified as Level 2, due to the fact that the fair value for these instruments is determined utilizing observable inputs in non-active markets. Equity securities primarily consist of investments with readily determinable market values associated with the Company’s excess benefit plan. The Company’s derivative instruments consist of over-the-counter contracts, which are not traded on a public exchange. Fuel derivative instruments currently consist solely of option contracts, whereas interest rate derivatives consist solely of swap agreements. See Note 10 for further information on the Company’s derivative instruments and hedging activities. The Company’s Treasury Department, which reports to the Chief Financial Officer, determines the value of option contracts utilizing an option pricing model based on inputs that are either readily available in public markets, can be derived from information available in publicly quoted markets, or are provided by financial institutions that trade these contracts. The option pricing model used by the Company is an industry standard model for valuing options and is a similar model used by the broker/dealer community (i.e., the Company’s counterparties). The inputs to this option pricing model are the option strike price, underlying price, risk free rate of interest, time to expiration, and volatility. Because certain inputs used to determine the fair value of option contracts are unobservable (principally implied volatility), the Company has categorized these option contracts as Level 3. Volatility information is obtained from external sources, but is analyzed by the Company for reasonableness and compared to similar information received from other external sources. The fair value of option contracts considers both the intrinsic value and any remaining time value associated with those derivatives that have not yet settled. The Company also considers counterparty credit risk and its own credit risk in its determination of all estimated fair values. To validate the reasonableness of the Company’s option pricing model, on a monthly basis, the Company compares its option valuations to third party valuations. If any significant differences were to be noted, they would be researched in order to determine the reason. However, historically, no significant differences have been noted. The Company has consistently applied these valuation techniques in all periods presented and believes it has obtained the most accurate information available for the types of derivative contracts it holds. Included in Equity securities are the Company's investments primarily associated with its deferred compensation plans, which consist of mutual funds that are publicly traded and for which market prices are readily available. These plans are non-qualified deferred compensation plans designed to hold contributions in excess of limits established by the Internal Revenue Code of 1986, as amended. The distribution timing and payment amounts under these plans are made based on the participant's distribution election and plan balance. Assets related to the funded portions of the deferred compensation plans are held in a rabbi trust, and the Company remains liable to these participants for the unfunded portion of the plans. The Company records changes in the fair value of plan obligations and plan assets, which net to zero, within the Salaries, wages, and benefits line and Other (gains) losses, net line, respectively, of the Consolidated Statement of Income.The significant unobservable input used in the fair value measurement of the Company’s derivative option contracts is implied volatility. Holding other inputs constant, an increase (decrease) in implied volatility would have resulted in a higher (lower) fair value measurement, respectively, for the Company’s derivative option contracts.
Software Capitalization | The Company capitalizes certain internal and external costs related to the acquisition and development of internal use software during the application development stages of projects. The Company amortizes these costs using the straight-line method over the estimated useful life of the software, which is typically five to fifteen years. Costs incurred during the preliminary project or the post-implementation/operation stages of the project are expensed as incurred. Capitalized computer software, included as a component of Ground property and equipment in the accompanying Consolidated Balance Sheet, net of accumulated depreciation, was $1.1 billion and $1.0 billion as of December 31, 2024, and 2023, respectively. Computer software depreciation expense was $271 million, $246 million, and $232 million for the years ended December 31, 2024, 2023, and 2022, respectively, and is included as a component of Depreciation and amortization expense in the accompanying Consolidated Statement of Income. The Company evaluates internal use software for impairment on a quarterly basis, and if it is determined the value of an asset was not recoverable or it qualifies for impairment, a charge will be recorded to write down the software to the lower of its carrying value or fair value. The Company had no significant impairments during 2024, 2023, or 2022.
Insurance Reserves | The Company uses a combination of insurance and self-insurance mechanisms, including a wholly-owned captive insurance entity and participation in a reinsurance treaty, to provide for the potential liabilities associated with certain risks, including workers’ compensation, healthcare benefits, general liability, and aviation liability. Liabilities associated with the risks that are retained by the Company are not discounted and are estimated, in part, by considering historical claims experience, demographics, exposure and severity factors and other actuarial assumptions.
Income Taxes | The Company accounts for deferred income taxes utilizing an asset and liability method, whereby deferred tax assets and liabilities are recognized based on the tax effect of temporary differences between the financial statements and the tax basis of assets and liabilities, as measured by current enacted tax rates. The Company also evaluates the need for a valuation allowance to reduce deferred tax assets to estimated recoverable amounts. The Company uses the portfolio approach for releasing income tax effects associated with amounts reclassified out of Accumulated other comprehensive income (loss). The Company’s policy for recording interest and penalties associated with uncertain tax positions is to record such items as a component of Income (loss) before income taxes. Penalties are recorded in Other (gains) losses, net, and interest paid or received is recorded in Interest expense or Interest income, respectively, in the accompanying Consolidated Statement of Income. There were no material amounts recorded for penalties and interest related to uncertain tax positions for all years presented.
Concentration Risk | Approximately 82 percent of the Company’s Employees are unionized and are covered by collective-bargaining agreements. As of December 2024, all the Company's collective bargaining labor contracts subject to Section 6 of the Railway Labor Act are closed until October 2026 when the next labor contract becomes amendable. The Company attempts to minimize its concentration risk with regards to its cash, cash equivalents, and its investment portfolio. This is accomplished by diversifying and limiting amounts among different counterparties, the type of investment, and the amount invested in any individual security or money market fund. To manage risk associated with financial derivative instruments held, the Company selects and will periodically review counterparties based on credit ratings, limits its exposure to a single counterparty, and monitors the market position of the program and its relative market position with each counterparty. The Company also has agreements with counterparties containing early termination rights and/or bilateral collateral provisions whereby security is required if market risk exposure exceeds a specified threshold amount or credit ratings fall below certain levels. Collateral deposits provided to or held from counterparties serve to decrease, but not totally eliminate, the credit risk associated with the Company’s hedging program. See Note 10 for further information. As of December 31, 2024, the Company operated an all-Boeing fleet, all of which are variations of the Boeing 737. The Boeing 737 MAX aircraft ("MAX") are crucial to the Company’s growth plans and fleet modernization initiatives. Boeing has in the past experienced, and may continue to experience, delays in fulfilling its commitments with regards to delivery of the Boeing 737-8 ("-8") to the Company as a result of manufacturing challenges. Further, the Company's contractual delivery schedule for the Boeing 737-7 ("-7") is dependent on the FAA issuing required certifications and approvals to the Boeing Company ("Boeing") and the Company. The FAA will ultimately determine the timing of the -7 certification and entry into service, and the Company therefore offers no assurances that current estimations and timelines are correct. Boeing no longer manufactures versions of the 737 other than the MAX family of aircraft. If the MAX aircraft were to become unavailable for the Company’s flight operations, the Company’s growth would be restricted unless and until it could procure and operate other types of aircraft from Boeing or another manufacturer, seller, or lessor, and the Company’s operations would be materially adversely affected. In particular, if the Company’s growth were to be dependent upon the introduction of a new aircraft make and model to the Company’s fleet, the Company would need to, among other things, (i) develop and implement new maintenance, operating, and training programs, (ii) secure extensive regulatory approvals, and (iii) implement new technologies. The requirements associated with operating a new aircraft make and model could take an extended period of time to fulfill and would likely impose substantial costs on the Company. A shift away from a single fleet type could also add complexity to the Company’s operations, present operational and compliance risks, and materially increase the Company's costs. Any of these events would have a material, adverse effect on the Company's business, operating results, and financial condition. The Company could also be materially adversely affected if the pricing or operational attributes of its aircraft were to become less competitive. The Company is also dependent on sole or limited suppliers for aircraft engines and certain other aircraft parts and services. Therefore, it would also be materially adversely impacted in the event of the unavailability of engines, parts and certain repair services, the inability to find adequate support at commercially reasonable terms, or mechanical or regulatory issues associated with such engines or other parts or services. The Company has historically entered into agreements with some of its co-brand, payment, and loyalty partners that contain exclusivity aspects which place certain confidential restrictions on the Company from entering into certain arrangements with other payment and loyalty partners. These arrangements generally extend for the terms of the agreements, none of which extend beyond October 31, 2030 as of December 31, 2024. Some of these agreements automatically renew on an annual basis, unless either party objects to such extension. In January 2025, the Company reached an amended co-brand agreement with Chase Bank USA, N.A. ("Chase"). Among other items, the amendment includes enhanced Cardmember benefits associated with the Company's future assigned and premium seating initiative. None of these agreements are more than 10 years in length. The Company believes the financial benefits generated by the exclusivity aspects of these arrangements outweigh the risks involved with such agreements.
Operating Segments and Related Disclosures | Operating segments are defined as components of an enterprise with separate financial information, which are evaluated regularly by the chief operating decision maker ("CODM") and are used in resource allocation and performance assessments. The Company's CODM is considered to be the Company's President, Chief Executive Officer, & Vice Chairman of the Board of Directors. The Company is managed as a single operating segment that provides air transportation for passengers and cargo. Managing the Company as one segment allows the Company to benefit from the value of integrated revenue pricing and its route network. The Company's flight equipment, which are all variations of the Boeing 737 series of aircraft, forms one fleet that is deployed through a single route scheduling system to maximize its value. The Company's tangible assets consist primarily of flight equipment, which are mobile across geographic markets and, therefore, have not been allocated. Financial information and annual operational plans and forecasts are prepared and reviewed by the CODM at the consolidated level. The CODM assesses performance for the Company's single reportable segment and decides how to allocate resources based on Net income (see the Consolidated Statement of Income). When making operational decisions, the CODM is indifferent to the results on a geographic region basis. The Company's objective in making resource allocation decisions is to optimize the consolidated financial results. For single reportable segment-level financial information, total assets, and significant non-cash transactions, see Item 8. Financial Statements.
New Accounting Pronouncements and Accounting Changes | On November 4, 2024, the Financial Accounting Standards Board (the "FASB") issued Accounting Standards Update ("ASU") 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. This standard responds to investor input by requiring public companies to disclose, in interim and annual reporting periods, additional information about certain expenses in the notes to the financial statements. This standard is effective for all entities that are subject to Subtopic 220-40, for annual periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027, but early adoption is permitted. The Company is evaluating this new standard but does not expect it to have a significant impact on its financial statement disclosures. On December 14, 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. This standard increases transparency and decision usefulness of income tax disclosures for investors by requiring information to better assess how an entity's operations and related tax risks and tax planning and operational opportunities affect its tax rate and prospects for future cash flows. This standard requires entities to provide enhanced disclosures related to the income tax rate reconciliation and income taxes paid. This standard is effective for all entities that are subject to Topic 740, Income Taxes for annual periods beginning after December 15, 2024, but early adoption is permitted. The Company has evaluated this new standard and does not expect it to have a significant impact on its financial statement disclosures. The Company will adopt this standard as of January 1, 2025, utilizing the retrospective application as permitted in the standard. See Note 14 for further information on the Company's income taxes. On November 27, 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. This standard improves reportable segment disclosures by adding and enhancing interim disclosure requirements, clarifying circumstances in which entities can disclose multiple segment measures of profit or loss, providing new segment disclosure requirements for entities with a single reportable segment, and adding other disclosure requirements. This standard is effective for all entities that are subject to Topic 280, Segment Reporting for annual periods beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. This standard is applicable to the Company due to the single reportable segment requirement. The Company has included all required disclosures within its Form 10-K for the year ended December 31, 2024. See Note 1 for further information on segment disclosures. On January 7, 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848). This standard provides optional temporary guidance for entities transitioning away from London Interbank Offered Rate ("LIBOR") to new reference interest rates so that derivatives affected by the discounting transition are explicitly eligible for certain optional expedients and exceptions with Topic 848. These amendments do not apply to any contract modifications made after December 31, 2024, any new hedging relationships entered into after December 31, 2024, or to existing hedging relationships evaluated for effectiveness existing as of December 31, 2024, that apply certain optional practical expedients. This standard was effective immediately and may be applied (i) on a full retrospective basis as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020, or (ii) on a prospective basis to new modifications from any date within an interim period that includes or is subsequent to the date of the issuance of a final update, up to the date that financial statements are available to be issued. The Company had no material LIBOR-related contract modifications during the twelve months ended December 31, 2024.
Net Income Per Share | Basic net income per share is calculated by dividing net income by the weighted average of shares outstanding during the period. Diluted net income per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. An immaterial number of shares related to the Company's restricted stock units were excluded from the denominator for the fiscal years ended December 31, 2024, 2023, and 2022 because inclusion of such shares would be antidilutive.
Stock Plans | Grants of RSUs result in the creation of a deferred tax asset, which is a temporary difference, until the time the RSU vests. All excess tax benefits and tax deficiencies are recorded through the Consolidated Statement of Income. Due to the treatment of RSUs for tax purposes, the Company’s effective tax rate from year to year is subject to variability.
Financial Derivative Instruments | The Company has used financial derivative instruments for both short-term and long-term timeframes, and historically has used a mixture of purchased call options, collar structures (which include both a purchased call option and a sold put option), call spreads (which include a purchased call option and a sold call option), put spreads (which include a purchased put option and a sold put option), and fixed price swap agreements in its portfolio. Although the use of collar structures and swap agreements can reduce the overall cost of hedging, these instruments carry more risk than purchased call options in that the Company could end up in a liability position when the collar structure or swap agreement settles. With the use of purchased call options and call spreads, the Company cannot be in a liability position at settlement, but does not have coverage once market prices fall below the strike price of the purchased call option. For the purpose of evaluating its net cash spend for jet fuel and for forecasting its future estimated jet fuel expense, the Company evaluates its hedge volumes strictly from an "economic" standpoint and thus does not consider whether the hedges have qualified or will qualify for hedge accounting. The Company defines its "economic" hedge as the net volume of fuel derivative contracts held, including the impact of positions that have been offset through sold positions, regardless of whether those contracts qualify for hedge accounting. The level at which the Company is economically hedged for a particular period is also dependent on current market prices for that period, as well as the types of derivative instruments held and the strike prices of those instruments. For example, the Company may enter into "out-of-the-money" option contracts (including "catastrophic" protection, which the Company defines as prices significantly higher than historical average levels), which may not generate intrinsic gains at settlement if market prices do not rise above the option strike price. Therefore, even though the Company may have an economic hedge in place for a particular period, that hedge may not produce any hedging gains at settlement and may even produce hedging losses depending on market prices, the types of instruments held, and the strike prices of those instruments. Upon proper qualification, the Company accounts for its fuel derivative instruments as cash flow hedges. Qualification is re-evaluated quarterly, and all periodic changes in fair value of the derivatives designated as hedges are recorded in AOCI until the underlying jet fuel is consumed. See Note 12. If a derivative initially does not qualify or ceases to qualify for hedge accounting, any change in the fair value of derivative instruments since the last reporting period would be recorded in Other (gains) losses, net in the Consolidated Statement of Income in the period of the change; however, any amounts previously recorded to AOCI would remain there until such time as the original forecasted transaction occurs, at which time these amounts would be reclassified to Fuel and oil expense. Factors that have and may continue to lead to the loss of hedge accounting include: significant fluctuation in energy prices or volumes of fuel purchased, significant weather events affecting refinery capacity and the production of refined products, and the volatility of the different types of products the Company uses in hedging. Certain types of derivative instruments do not qualify for hedge accounting, including those that result in a net sold position (sold gallons exceeding purchased gallons). Increased volatility in certain commodity markets for an extended period of time, especially if such volatility were to worsen, could cause the Company to lose hedge accounting altogether for the commodities used in its fuel hedging program, which would create further volatility in the Company’s GAAP financial results. However, even though certain derivatives may not qualify for hedge accounting, the Company continues to hold the instruments as management believes they continue to afford the Company the opportunity to stabilize jet fuel costs. When the Company has sold derivative positions in order to effectively "close" or offset a derivative already held as part of its fuel hedging portfolio, any subsequent changes in fair value of those positions are marked to market through the Consolidated Statement of Income. Likewise, any changes in fair value of those positions that were offset by entering into the sold positions and were de-designated as hedges are concurrently marked to market through the Consolidated Statement of Income. However, any changes in value related to hedges that were deferred as part of AOCI while designated as a hedge would remain until the originally forecasted transaction occurs. In a situation where it becomes probable that a fuel hedged forecasted transaction will not occur, any gains and/or losses that have been recorded to AOCI would be required to be immediately reclassified into the Consolidated Statement of Income. During third quarter 2024, the routine statistical analysis performed by the Company to determine which commodities qualify for special hedge accounting treatment on a prospective basis indicated that WTI crude oil-based derivatives no longer qualified for hedge accounting. This change was primarily due to the fact that the correlation between WTI crude oil prices and jet fuel prices during recent periods had not been as strong as in the past, and therefore the Company could no longer demonstrate that derivatives based on WTI crude oil prices would result in effective hedges on a prospective basis. As such, all WTI-based instruments were de-designated from their hedging relationships and the change in fair value of all of the Company's derivatives based in WTI was recorded to Other (gains) losses for third and fourth quarter 2024. All WTI crude oil based derivatives in the Company's portfolio have settled as of December 31, 2024. The change in fair value of the Company's WTI derivative contracts during the second half of 2024 was a decrease of $37 million, which resulted in a corresponding loss in the Consolidated Statement of Income. Any amounts previously recorded to AOCI remained there until the original forecasted transaction occurred in accordance with hedge accounting requirements. Accounting pronouncements pertaining to derivative instruments and hedging are complex with stringent requirements, including the documentation of a Company hedging strategy, statistical analysis to qualify a commodity for hedge accounting both on a historical and a prospective basis, and strict contemporaneous documentation that is required at the time each hedge is designated by the Company. This statistical analysis involves utilizing regression analyses that compare changes in the price of jet fuel to changes in the prices of the commodities used for hedging purposes All of the Company's fuel derivative instruments are subject to agreements that follow the netting guidance in the applicable accounting standards for derivatives and hedging. The types of derivative instruments the Company has determined are subject to netting requirements in the accompanying Consolidated Balance Sheet are those in which the Company pays or receives cash for transactions with the same counterparty and in the same currency via one net payment or receipt. For cash collateral held by the Company or provided to counterparties, the Company nets such amounts against the fair value of the Company's derivative portfolio by each counterparty. The Company has elected to utilize netting for its fuel derivative instruments and also classifies such amounts as either current or noncurrent, based on the net fair value position with each of the Company's counterparties in the Consolidated Balance Sheet. If the Company's fuel derivative instruments are in a net asset position with a counterparty, cash collateral amounts held are first netted against current outstanding derivative asset amounts associated with that counterparty until that balance is zero, and then any remainder is applied against the fair value of noncurrent outstanding derivative instruments. The Company is at times party to certain interest rate swap agreements that are accounted for as cash flow hedges, but had none in place as of December 31, 2024. During fourth quarter 2023, the Company terminated $150 million notional value of forward-starting interest rate swap agreements associated with the Company's forecasted issuance of debt. These swap agreements had been classified as cash flow hedges, and all fair market value changes were recorded to AOCI prior to their termination. The effect of this termination is that the value of the swaps originally recorded in AOCI, a gain of $23 million, will be amortized to Interest expense over the life of new debt instruments, which could be issued through 2027. The Company also did not have any interest rate swap agreements designated as fair value hedges, as defined, during the periods presented.
Employee Retirement Plans | Unrecognized prior service cost is expensed using a straight-line amortization of the cost over the average future service of Employees expected to receive benefits under the plans. Actuarial gains are amortized utilizing the minimum amortization method. The selection of a discount rate is made annually and is selected by the Company based upon comparison of the expected future cash flows associated with the Company’s future payments under its consolidated benefit obligations to a yield curve created using high quality bonds that closely match those expected future cash flows. This rate for postretirement benefits increased during 2024 due to market conditions. The assumed healthcare trend rate is also reviewed at least annually and is determined based upon both historical experience with the Company’s benefits paid and expectations of how those trends may or may not change in future years. The expected long-term rate of return on plan assets is based on historical market and volatility data and expected market conditions, reflecting a target asset allocation of 40 percent equities and 60 percent fixed income. The Company reviews the rate of return on plan assets assumption annually. The annual investment performance for one particular year does not, by itself, significantly influence the Company's evaluation.

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