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FAIR VALUE MEASUREMENTS | 6 Months Ended
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Jun. 30, 2025
Fair Value Disclosures [Abstract] |
FAIR VALUE MEASUREMENTS | FAIR VALUE MEASUREMENTS In determining fair value, there is a three-level hierarchy based on the reliability of the inputs used. Level 1 refers to fair values based on quoted prices for identical instruments in active markets. Level 2 refers to fair values estimated using significant other observable inputs such as similar instruments in active markets or quoted prices for identical or similar instrument in markets that are not active. Fair values for Level 2 instruments are determined using standard valuation models that incorporate inputs such as quoted prices for similar assets, interest rates, benchmark curves, credit ratings, and other observable inputs or market data. Level 3 refers to fair values estimated using significant unobservable inputs for which there is little or no market data and that are significant to the fair value of the assets. Fair values for Level 3 instruments are determined using future cash flows and discount rates, which include information obtained from third-party valuation sources and other market sources, including recent offers from potential buyers. Fair value of financial instruments measured on a recurring basis As of June 30, 2025, cost basis and fair value for marketable securities were $1.4 billion. Differences in cost basis and fair value of marketable securities are primarily a result of changes in interest rates and general market conditions. The Company does not believe any unrealized losses are the result of credit quality based on its evaluation of industry and duration exposure, credit ratings of the securities, liquidity profiles, and other observable information as of June 30, 2025. Fair values of financial instruments on the unaudited condensed consolidated balance sheets:
| June 30, 2025
(in millions) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |
U.S. government and agency securities | $ | 342 |  |  | $ | — |  |  | $ | — |  |  | $ | 342 |
Equity mutual funds | 7 |  |  | — |  |  | — |  |  | 7 |
Asset-backed securities | — |  |  | 194 |  |  | 3 |  |  | 197 |
Mortgage-backed securities | — |  |  | 197 |  |  | — |  |  | 197 |
Corporate notes and bonds | — |  |  | 615 |  |  | — |  |  | 615 |
Municipal securities and other | — |  |  | 16 |  |  | — |  |  | 16 |
Total Marketable securities | $ | 349 |  |  | $ | 1,022 |  |  | $ | 3 |  |  | $ | 1,374 |
| December 31, 2024
(in millions) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |
U.S. government and agency securities | $ | 292 |  |  | $ | — |  |  | $ | — |  |  | $ | 292 |
Equity mutual funds | 7 |  |  | — |  |  | — |  |  | 7 |
Asset-backed securities | — |  |  | 127 |  |  | 7 |  |  | 134 |
Mortgage-backed securities | — |  |  | 112 |  |  | — |  |  | 112 |
Corporate notes and bonds | — |  |  | 696 |  |  | 2 |  |  | 698 |
Municipal securities and other | — |  |  | 31 |  |  | — |  |  | 31 |
Total Marketable securities | $ | 299 |  |  | $ | 966 |  |  | $ | 9 |  |  | $ | 1,274 |
The fair value of derivative instruments, including fuel hedge contracts and interest rate swaps, was not material as of June 30, 2025 and December 31, 2024. Activity and maturities for marketable securities Maturities for marketable securities:
June 30, 2025 (in millions) | Cost Basis |  | Fair Value
Due in one year or less | $ | 285 |  |  | $ | 285 |
Due after one year through five years | 933 |  |  | 933 |
Due after five years through ten years | 144 |  |  | 144 |
Due after ten years | 6 |  |  | 5 |
No maturity date | 5 |  |  | 7 |
Total | $ | 1,373 |  |  | $ | 1,374 |
Fair value of other financial instruments The Company uses the following methods and assumptions to determine the fair value of financial instruments that are not recognized at fair value as described below. Debt: The estimated fair value of fixed-rate Enhanced Equipment Trust Certificate (EETC) debt and certain variable rate debt is Level 2, while the estimated fair value of $712 million of certain variable-rate and fixed-rate debt, including PSP notes payable and Japanese Yen denominated debt, is classified as Level 3. Fixed-rate debt on the unaudited condensed consolidated balance sheets and the estimated fair value of long-term fixed-rate debt:
(in millions) | June 30, 2025 |  | December 31, 2024
Fixed-rate debt | $ | 2,868 |  |  | $ | 2,946 |
Estimated fair value | $ | 2,806 |  |  | $ | 2,844 |
Assets and liabilities measured at fair value on a nonrecurring basis Certain assets and liabilities are recognized or disclosed at fair value on a nonrecurring basis, including property, plant and equipment, operating and finance lease assets, goodwill, and intangible assets. These assets are subject to fair valuation when there is evidence of impairment. No material impairments were recorded during the three and six months ended June 30, 2025.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details
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