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FAIR VALUE MEASUREMENTS
 9 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS
Assets/(Liabilities) Measured at Fair Value on a Recurring Basis
(in millions)September 30,
2025		Level 1Level 2Level 3
Cash equivalents$2,364 $2,364 $— $— 
Restricted cash equivalents180 180 — — 
Long-term investments and related3,391 3,051 185 155 
Fuel hedge contracts4 — 4 — 

(in millions)December 31,
2024		Level 1Level 2Level 3
Cash equivalents$1,619 $1,619 $— $— 
Restricted cash equivalents351 351 — — 
Long-term investments and related2,372 2,085 160 127 
Fuel hedge contracts(17)— (17)— 

Cash Equivalents and Restricted Cash Equivalents. Cash equivalents generally consist of money market funds. Restricted cash equivalents generally consist of money market funds, time deposits, commercial paper and negotiable certificates of deposit. Restricted cash equivalents primarily relate to certain self-insurance obligations and airport commitments as well as proceeds from debt issued to finance, among other things, a portion of the construction costs for our new terminal facilities at New York's LaGuardia Airport. Restricted cash equivalents are recorded in prepaid expenses and other and other noncurrent assets on our Consolidated Balance Sheet ("balance sheet"). The fair value of these cash equivalents is based on a market approach using prices generated by market transactions involving identical or comparable assets.
Long-Term Investments and Related. Our long-term investments measured at fair value primarily consist of equity investments, which are valued based on market prices or other observable transactions and inputs, and are recorded in equity investments on our balance sheet. Our equity investments in private companies are classified as Level 3 in the fair value hierarchy as their equity is not traded on a public exchange and our valuations incorporate certain unobservable inputs, including non-public equity issuances. Fair value measurement using unobservable inputs is inherently uncertain, and a change in significant inputs could result in different fair values. See Note 4, "Investments," for further information on our equity investments.

Fuel Hedge Contracts. Our derivative contracts to hedge the financial risk from changing fuel prices are related to inventory at our wholly-owned subsidiary, Monroe Energy, LLC ("Monroe"). We recognized a loss of $21 million and a gain of $12 million on our fuel hedge contracts in aircraft fuel and related taxes on our Condensed Consolidated Statements of Operations and Comprehensive Income ("income statement") for the three and nine months ended September 30, 2025, respectively, compared to gains of $89 million and $9 million for the three and nine months ended September 30, 2024, respectively. The gain recognized during the first nine months of 2025 was composed of $21 million of mark-to-market gains and $9 million of settlement losses on contracts. Gains and losses on settled contracts are reflected within Monroe's operating results. See Note 9, "Segments," for further information on our refinery segment.