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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Schedule of Assets Measured at Fair Value on Recurring Basis
Assets measured at fair value on a recurring basis are summarized below (in millions):
 Fair Value Measurements as of March 31, 2024
 TotalLevel 1Level 2Level 3
Short-term investments (1), (2):
Money market funds$350 $350 $— $— 
Corporate obligations5,010 — 5,010 — 
Bank notes/certificates of deposit/time deposits1,886 — 1,886 — 
Repurchase agreements450 — 450 — 
7,696 350 7,346 — 
Restricted cash and short-term investments (1), (3)
895 436 459 — 
Long-term investments (4)
117 117 — — 
Total$8,708 $903 $7,805 $— 
(1)All short-term investments are classified as available-for-sale and stated at fair value. Unrealized gains and losses are recorded in accumulated other comprehensive loss at each reporting period. There were no credit losses.
(2)Our short-term investments mature in one year or less.
(3)Restricted cash and short-term investments primarily include collateral held to support workers’ compensation obligations and collateral associated with the payment of interest for the AAdvantage Financing. Restricted short-term investments mature in one year or less except for $207 million as of March 31, 2024.
(4)Long-term investments include our equity investments in China Southern Airlines Company Limited (China Southern Airlines), Vertical Aerospace Ltd. (Vertical) and GOL Linhas Aéreas Inteligentes S.A. (GOL). See Note 8 for further information on our equity investments.
Schedule of Carrying Value and Estimated Fair Value of Long-Term Debt, Including Current Maturities
The carrying value and estimated fair value of our long-term debt, including current maturities, were as follows (in millions):
 March 31, 2024December 31, 2023
 
Carrying
Value
Fair
Value
Carrying
Value
Fair
Value
Long-term debt, including current maturities$31,827 $32,159 $32,396 $32,310 
American Airlines, Inc.  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Schedule of Assets Measured at Fair Value on Recurring Basis
Assets measured at fair value on a recurring basis are summarized below (in millions):
 Fair Value Measurements as of March 31, 2024
 TotalLevel 1Level 2Level 3
Short-term investments (1), (2):
Money market funds$348 $348 $— $— 
Corporate obligations5,010 — 5,010 — 
Bank notes/certificates of deposit/time deposits1,884 — 1,884 — 
Repurchase agreements450 — 450 — 
7,692 348 7,344 — 
Restricted cash and short-term investments (1), (3)
895 436 459 — 
Long-term investments (4)
117 117 — — 
Total$8,704 $901 $7,803 $— 
(1)All short-term investments are classified as available-for-sale and stated at fair value. Unrealized gains and losses are recorded in accumulated other comprehensive loss at each reporting period. There were no credit losses.
(2)American’s short-term investments mature in one year or less.
(3)Restricted cash and short-term investments primarily include collateral held to support workers’ compensation obligations and collateral associated with the payment of interest for the AAdvantage Financing. Restricted short-term investments mature in one year or less except for $207 million as of March 31, 2024.
(4)Long-term investments include American’s equity investments in China Southern Airlines Company Limited (China Southern Airlines), Vertical Aerospace Ltd. (Vertical) and GOL Linhas Aéreas Inteligentes S.A. (GOL). See Note 7 for further information on American’s equity investments.
Schedule of Carrying Value and Estimated Fair Value of Long-Term Debt, Including Current Maturities
The carrying value and estimated fair value of American’s long-term debt, including current maturities, were as follows (in millions):
 March 31, 2024December 31, 2023
 Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
Long-term debt, including current maturities$26,606 $26,763 $27,177 $27,008