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GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES | GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Organization and Basis of Presentation The consolidated financial statements include the accounts of Air Group, or the Company, and its primary subsidiaries, Alaska, Horizon, and Virgin America. Our consolidated financial statements also include McGee Air Services, a subsidiary of Alaska. The Company conducts substantially all of its operations through these subsidiaries. All significant intercompany balances and transactions have been eliminated. These financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America and their preparation requires the use of management’s estimates. Actual results may differ from these estimates. Certain reclassifications have been made to prior year financial statements to conform to classifications used in the current year. Cash and Cash Equivalents Cash equivalents consist of highly liquid investments with original maturities of three months or less, such as money market funds, commercial paper and certificates of deposit. They are carried at cost, which approximates market value. The Company reduces cash balances when funds are disbursed. Due to the time delay in funds clearing the banks, the Company normally maintains a negative balance in its cash disbursement accounts, which is reported as a current liability. The amount of the negative cash balance was $10 million and $15 million at December 31, 2017 and 2016 respectively, and is included in accounts payable, with the change in the balance during the year included in other financing activities in the consolidated statements of cash flows. The Company's restricted cash balances are primarily used to guarantee various letters of credit, self-insurance programs or other contractual rights. Restricted cash consists of highly liquid securities with original maturities of three months or less. They are carried at cost, which approximates fair value. Marketable Securities Investments with original maturities of greater than three months and remaining maturities of less than one year are classified as short-term investments. Investments with maturities beyond one year may be classified as short-term based on their highly liquid nature and because such marketable securities represent the investment of cash that is available for current operations. All cash equivalents and short-term investments are classified as available-for-sale and realized gains and losses are recorded using the specific identification method. Changes in market value, excluding other-than-temporary impairments, are reflected in accumulated other comprehensive loss (AOCL). Investments are considered to be impaired when a decline in fair value is judged to be other-than-temporary. The Company uses a systematic methodology that considers available quantitative and qualitative evidence in evaluating potential impairment. If the cost of an investment exceeds its fair value, management evaluates, among other factors, general market conditions, credit quality of debt instrument issuers, the duration and extent to which the fair value is less than cost, the Company's intent and ability to hold, or plans to sell, the investment. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is recorded to Other—net in the consolidated statements of operations and a new cost basis in the investment is established. Inventories and Supplies—net Expendable aircraft parts, materials and supplies are stated at average cost and are included in inventories and supplies—net. An obsolescence allowance for expendable parts is accrued based on estimated lives of the corresponding fleet type and salvage values. The allowance for expendable inventories was $38 million and $36 million at December 31, 2017 and 2016, respectively. Inventory and supplies—net also includes fuel inventory of $23 million and $16 million at December 31, 2017 and 2016, respectively. Repairable and rotable aircraft parts inventories are included in flight equipment. Property, Equipment and Depreciation Property and equipment are recorded at cost and depreciated using the straight-line method over their estimated useful lives less an estimated salvage value, which are as follows:
| Estimated Useful Life | Estimated Salvage Value
Aircraft and other flight equipment: |  |
Boeing 737, Airbus A319/320, and E175 aircraft | 20-25 years | 10%
Bombardier Q400 aircraft | 15 years | 10%
Buildings | 25 - 30 years | —%
Minor building and land improvements | 10 years | —%
Capitalized leases and leasehold improvements | Generally shorter of lease term or estimated useful life | 0-10%
Computer hardware and software | 3-10 years | —%
Other furniture and equipment | 5-10 years | —%
Near the end of an asset's estimated useful life, management updates the salvage value estimates based on current market conditions and expected use of the asset. Repairable and rotable aircraft parts are included in Aircraft and other flight equipment, and are depreciated over the associated fleet life. In 2016, the Company changed its accounting estimate for the expected useful life of the B737 NextGen aircraft, which includes the B737-700, -800, -900, -900ER aircraft and the related parts, from 20 years to 25 years. The change in estimate was precipitated by management's annual accounting policy review, which considered market studies, asset performance and intended use, as well as industry benchmarking. The change in estimate was applied prospectively effective October 1, 2016. Capitalized interest, based on the Company’s weighted-average borrowing rate, is added to the cost of the related asset, and is depreciated over the estimated useful life of the asset. Maintenance and repairs, other than engine maintenance on B737-800 engines, are expensed when incurred. Major modifications that extend the life or improve the usefulness of aircraft are capitalized and depreciated over their estimated period of use. Maintenance on B737-800 engines is covered under a power-by-the-hour agreement with a third party beginning in the fourth quarter of 2017, whereby the Company pays a determinable amount, and transfers risk, to a third party. The Company expenses the contract amounts based on engine usage. The Company evaluates long-lived assets to be held and used for impairment whenever events or changes in circumstances indicate that the total carrying amount of an asset or asset group may not be recoverable. The Company groups assets for purposes of such reviews at the lowest level, at which identifiable cash flows are largely independent of the cash flows of other groups of assets and liabilities. An impairment loss is considered when estimated future undiscounted cash flows expected to result from the use of the asset or asset group and its eventual disposition are less than its carrying amount. If the asset or asset group is not considered recoverable, a write-down equal to the excess of the carrying amount over the fair value will be recorded. Goodwill Goodwill represents the excess of purchase price over the fair value of the related net assets acquired in the Company's acquisition of Virgin America and is not amortized. As of December 31, 2017 the goodwill balance was $1.9 billion, and is associated with the Mainline reporting unit. The Company reviews goodwill for impairment annually in Q4, or more frequently if events or circumstances indicate than an impairment may exist. If fair value of the reporting unit does not exceed the carrying amount, an impairment charge may be recorded. In 2017, the fair value of the reporting unit with goodwill substantially exceeded its carrying value. Intangible Assets Intangible assets recorded in conjunction with the acquisition of Virgin America consist primarily of indefinite-lived airport slots, finite-lived airport gates and finite-lived customer relationships. Finite-lived intangibles are amortized over their estimated useful lives. Indefinite-lived intangibles are not amortized but are tested at least annually for impairment using a similar methodology to property, equipment and goodwill as described above. Deferred Revenue Deferred revenue results primarily from the sale of Mileage Plan™ miles to third-parties. It also includes Virgin America's Elevate® flown points outstanding at the acquisition date that were recorded at their estimated fair value as part of purchase price accounting. Recognition of this deferred revenue occurs when award transportation is provided or over the term of the applicable agreement. Operating Leases The Company leases aircraft, airport and terminal facilities, office space and other equipment under operating leases. Airport and terminal facility leases are variable based on volumes and expensed as incurred. Some of these lease agreements contain rent escalation clauses or rent holidays. For scheduled rent escalation clauses during the lease terms or for rental payments commencing at a date other than the date of initial occupancy, the Company records minimum rental expenses on a straight-line basis over the terms of the leases in the consolidated statements of operations. Leased Aircraft Return Costs Cash payments associated with returning leased aircraft are accrued when it is probable that a cash payment will be made and that amount is reasonably estimable, usually no sooner than after the last scheduled maintenance event prior to lease return. Any accrual is based on the time remaining on the lease, planned aircraft usage and the provisions included in the lease agreement, although the actual amount due to any lessor upon return may not be known with certainty until lease termination. As leased aircraft are returned, any payments are charged against the established accrual. The accrual is part of other current and long-term liabilities and was not material as of December 31, 2017 and December 31, 2016. The expense is included in Aircraft maintenance in the consolidated statements of operations. Revenue Recognition Passenger revenue is recognized when the passenger travels. Tickets sold but not yet used are reported as air traffic liability until travel or date of expiration. Air traffic liability includes approximately $106 million and $62 million related to credits for future travel, as of December 31, 2017 and December 31, 2016, respectively. These credits are recognized into revenue either when the passenger travels or at the date of expiration, which is twelve months from issuance. Commissions to travel agents and related fees are expensed when the related revenue is recognized. Passenger traffic commissions and related fees not yet recognized are recorded as a prepaid expense. Taxes collected from passengers, including transportation excise taxes, airport and security fees and other fees, are recorded on a net basis within passenger revenue in the consolidated statements of operations. Due to complex pricing structures, refund and exchange policies, and interline agreements with other airlines, certain amounts are recognized as revenue using estimates regarding both the timing of the revenue recognition and the amount of revenue to be recognized. These estimates are based on the Company’s historical data. Freight and mail revenues are recognized when the related services are provided. Other—net revenues are primarily related to the Mileage Plan™ program. They are recognized as described in the “Mileage Plan” paragraph below. Other—net also includes certain ancillary or non-ticket revenues, such as checked-bag fees, reservations fees, ticket change fees, on-board food and beverage sales, and, to a much lesser extent, commissions from car and hotel vendors and sales of travel insurance. These items are recognized as revenue when the related services are provided. Airport lounge memberships are recognized as revenue over the membership period. Frequent Flyer Programs Alaska operates the Mileage Plan™ frequent flyer program, and Virgin America operated the Elevate frequent flyer program for the duration of 2017. Both programs provide travel awards to members based on accumulated mileage or points. For miles earned by flying on the Company's airlines, and through airline partners, the estimated cost of providing award travel is recognized as a selling expense and accrued as a liability, as miles are earned and accumulated. Alaska and Virgin America also sell services, including miles or points for transportation, to non-airline partners, such as hotels, car rental agencies and major banks that offer Alaska's affinity credit card. The Company defers revenue related to air transportation and certificates for discounted companion travel until the transportation is delivered. The deferred proceeds are recognized as passenger revenue for awards redeemed and flown on the Company's airlines and as Other—net revenue for awards redeemed and flown on other airlines (less the cost paid to the other airlines based on contractual agreements). The elements that represent use of the Alaska and Virgin America brands and access to frequent flyer member lists and advertising are recognized as commission income in the period that those elements are sold and included in Other—net revenue in the consolidated statements of operations. Frequent flyer program deferred revenue and liabilities included in the consolidated balance sheets (in millions):
| 2017 |  | 2016
Current Liabilities: |  |  |
Other accrued liabilities | $ | 519 |  |  | $ | 484 |
Other Liabilities and Credits: |  |  |  |  |
Deferred revenue | 699 |  |  | 638 |
Other liabilities | 26 |  |  | 21 |
Total | $ | 1,244 |  |  | $ | 1,143 |
The amounts recorded in other accrued liabilities relate primarily to deferred revenue expected to be realized within one year, which includes Mileage Plan™ awards that have been issued but not yet flown for $47 million and $43 million at December 31, 2017 and 2016. Frequent flyer program revenue included in the consolidated statements of operations (in millions):
| 2017 |  | 2016 |  | 2015
Passenger revenues | $ | 380 |  |  | $ | 293 |  |  | $ | 267 |
Other—net revenues | 482 |  |  | 429 |  |  | 329 |
Total frequent flyer program revenues | $ | 862 |  |  | $ | 722 |  |  | $ | 596 |
Other—net revenue includes commission revenues of $396 million, $329 million, and $280 million in 2017, 2016, and 2015. Selling Expenses Selling expenses include credit card fees, global distribution systems charges, the estimated cost of frequent flyer travel awards earned through air travel, advertising, promotional costs, commissions and incentives. Advertising production costs are expensed as incurred. Advertising expense was $91 million, $61 million, and $55 million during the years ended December 31, 2017, 2016, and 2015. Derivative Financial Instruments The Company's operations are significantly impacted by changes in aircraft fuel prices and interest rates. In an effort to manage exposure to these risks, the Company periodically enters into fuel and interest rate derivative instruments. These derivative instruments are recognized at fair value on the balance sheet and changes in the fair value are recognized in AOCL or in the consolidated statements of operations, depending on the nature of the instrument. The Company does not apply hedge accounting to its derivative fuel hedge contracts nor does it hold or issue them for trading purposes. For cash flow hedges related to interest rate swaps, the effective portion of the derivative represents the change in fair value of the hedge that offsets the change in fair value of the hedged item. To the extent the change in the fair value of the hedge does not perfectly offset the change in the fair value of the hedged item, the ineffective portion of the hedge is immediately recognized in interest expense. Fair Value Measurements Accounting standards define fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The standards also establish a fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value: Level 1 - Quoted prices in active markets for identical assets or liabilities. Level 2 - Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The Company has elected not to use the fair value option provided in the accounting standards for non-financial instruments. Accordingly, those assets and liabilities are carried at amortized cost. For financial instruments, the assets and liabilities are carried at fair value, which is determined based on the market approach or income approach, depending upon the level of inputs used. Assets and liabilities recognized or disclosed at fair value on a nonrecurring basis include items such as property, plant and equipment, goodwill, intangible assets and certain other assets and liabilities. The Company determines the fair value of these items using Level 3 inputs, as described in Note 2 and Note 4. Income Taxes The Company uses the asset and liability approach for accounting for and reporting income taxes. Deferred tax assets and liabilities are recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities, and their respective tax bases and for operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in the period that includes the enactment date. A valuation allowance would be established, if necessary, for the amount of any tax benefits that, based on available evidence, are not expected to be realized. As of December 31, 2017, there is no valuation allowance against net deferred tax assets. The Company accounts for unrecognized tax benefits in accordance with the applicable accounting standards. Virgin America has substantial federal and state net operating losses (NOLs) for income tax purposes. The Company's ability to utilize Virgin America's NOLs could be limited if Virgin America had an “ownership change,” as defined in Section 382 of the Internal Revenue Code and similar state provisions. In general terms, an ownership change can occur whenever there is a collective shift in the ownership of a company by more than 50% by one or more “5% stockholders” within a three-year period. The occurrence of such a change generally limits the amount of NOL carryforwards a company could utilize in a given year to the aggregate fair market value of the company's common stock immediately prior to the ownership change, multiplied by the long-term tax-exempt interest rate in effect for the month of the ownership change. The acquisition constituted an ownership change and the potential for further limitations following the acquisition. See Note 6 to the consolidated financial statements for more discussion of the calculation. Stock-Based Compensation Accounting standards require companies to recognize as expense the fair value of stock options and other equity-based compensation issued to employees as of the grant date. These standards apply to all stock awards that the Company grants to employees as well as the Company’s Employee Stock Purchase Plan (ESPP), which features a look-back provision and allows employees to purchase stock at a 15% discount. All stock-based compensation expense is recorded in wages and benefits in the consolidated statements of operations. Earnings Per Share (EPS) Diluted EPS is calculated by dividing net income by the average common shares outstanding plus additional common shares that would have been outstanding assuming the exercise of in-the-money stock options and restricted stock units, using the treasury-stock method. In 2017, 2016, and 2015, antidilutive stock options excluded from the calculation of EPS were not material. Recently Issued Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-09, "Revenue from Contracts with Customers"(Topic 606), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. This comprehensive new standard will replace most existing revenue recognition guidance in U.S. GAAP. In March 2016, the FASB issued ASU 2016-08, "Revenue from Contracts with Customers (Topic 606), Principal versus Agent Considerations" to clarify the guidance on determining whether the Company is considered the principal or the agent in a revenue transaction where a third party is providing goods or services to a customer. Entities are permitted to use either a full retrospective or cumulative effect transition method, and are required to adopt all parts of the new revenue standard using the same transition method. The new standard became effective for the Company on January 1, 2018. Under the new standard, the Company estimates a net increase to Mileage Plan™ deferred revenues of approximately $345 million to $365 million as of the beginning of the retroactive reporting period (January 1, 2016) at the time of adoption. Additionally, the Company estimates the change in ticket breakage methodology will not have a significant impact on the statements of operations, but will decrease air traffic liability by approximately $70 million to $80 million at adoption of the standard. The overall impact to equity as of the beginning of the retroactive reporting period, including these, as well as other less material changes, is expected to be between $165 million and $175 million. In January 2016, the FASB issued ASU No. 2016-01, "Financial Instruments—Overall (Subtopic 825-10)." This standard makes several changes, including the elimination of the available-for-sale classification of equity investments, and requires equity investments with readily determinable fair values to be measured at fair value with changes in fair value recognized in net income. It is effective for the Company beginning January 1, 2018. The Company does not expect the adoption of ASU 2016-01 to have a material impact on its consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, "Leases" (Topic 842), which requires lessees to recognize assets and liabilities for leases currently classified as operating leases. Under the new standard a lessee will recognize a liability on the balance sheet representing the lease payments owed, and a right-of-use-asset representing its right to use the underlying asset for the lease term. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election not to recognize lease assets and lease liabilities. At this time, the Company believes the most significant impact to the financial statements will relate to the recording of a right of use asset associated with leased aircraft. Other leases, including airports and real estate, equipment, software and other miscellaneous leases continue to be assessed for impact as it relates to the ASU. The new standard is effective for the Company on January 1, 2019. The Company will not early adopt the standard. In March 2016, the FASB issued ASU 2016-09, "Compensation—Stock Compensation" (Topic 718), which simplifies several aspects of accounting for employee share-based payment awards, including the accounting for income taxes, forfeitures and statutory tax withholding requirements, as well as classification in the statement of cash flows. The ASU was adopted prospectively as of January 1, 2017. Prior periods have not been adjusted. The adoption of the standard did not have a material impact on the Company's statements of operations or financial position. In January 2017, the FASB issued ASU 2017-04, "Intangibles—Goodwill and Other" (Topic 350), which eliminates step 2 from the goodwill impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The ASU is effective for the Company beginning January 1, 2019. Early adoption of the standard is permitted. In 2017, the Company performed an impairment test for goodwill arising from its acquisition of Virgin America and adopted the standard effective January 1, 2017. In March 2017, the FASB issued ASU 2017-07, "Compensation—Retirement Benefits" (Topic 715), which will require the Company to present the service cost component of net periodic benefit cost as Wages and benefits in the statements of operations. All other components of net periodic benefit cost will be required to be presented in Nonoperating income (expense) in the statements of operations. These components will not be eligible for capitalization. The ASU is effective for the Company beginning January 1, 2018. Changes to the statements of operations under the ASU are applicable retrospectively. The adoption of this standard will have no impact on Income before income tax or Net income for the periods subject to retrospective reclassification. See Note 7 for the current components of the Company's net periodic benefit costs. In August 2017, the FASB issued ASU 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities." The ASU expands the activities that qualify for hedge accounting and simplifies the rules for reporting hedging relationships. The ASU is effective for the Company beginning January 1, 2019. The Company will not early adopt the standard.

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