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FAIR VALUE MEASUREMENTS
3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS
Assets/(Liabilities) Measured at Fair Value on a Recurring Basis
(in millions)March 31,
2024
Level 1Level 2Level 3
Cash equivalents$2,495 $2,495 $— $— 
Restricted cash equivalents501 501 — — 
Short-term investments
U.S. Government securities473 101 372 — 
Corporate obligations86 — 86 — 
Other fixed income securities30 — 30 — 
Long-term investments and related2,641 2,387 139 115 
Fuel hedge contracts(22)— (22)— 

(in millions)December 31,
2023
Level 1Level 2Level 3
Cash equivalents$1,545 $1,545 $— $— 
Restricted cash equivalents653 653 — — 
Short-term investments
U.S. Government securities859 204 655 — 
Corporate obligations218 — 218 — 
Other fixed income securities50 — 50 — 
Long-term investments and related2,867 2,614 134 119 
Fuel hedge contracts— — 
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 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 as well as certain self-insurance obligations and airport commitments. Restricted cash equivalents are recorded in prepaid expenses and other 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.

Short-Term Investments. The fair values of our short-term investments are based on a market approach using industry standard valuation techniques that incorporate observable inputs such as quoted market prices, interest rates, benchmark curves, credit ratings of the security and other observable information. These investments are expected to mature in one year or less.

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 losses of $96 million and gains of $31 million on our fuel hedge contracts in aircraft fuel and related taxes on our Condensed Consolidated Statements of Operations and Comprehensive Income/(Loss) ("income statement") for the three months ended March 31, 2024 and 2023, respectively. The losses recognized during the first three months of 2024 were composed of $27 million of mark-to-market losses and $69 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 Monroe refinery segment.