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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]  
Employee Benefit Plans Employee Benefit Plans
The following table provides the components of net periodic benefit cost (income) (in millions):
 Pension BenefitsRetiree Medical and Other
Postretirement Benefits
Three Months Ended March 31,2024202320242023
Service cost$— $— $8 $3 
Interest cost181 190 17 12 
Expected return on assets(244)(229)(2)(3)
Amortization of:
Prior service cost (benefit)— 7 3 (3)
Unrecognized net loss (gain)27 27 (6)(9)
Net periodic benefit cost (income)$(36)$(5)$20 $— 
Effective November 1, 2012, substantially all of our defined benefit pension plans were frozen.
The service cost component of net periodic benefit cost (income) is included in operating expenses and the other components of net periodic benefit cost (income) are included in nonoperating other expense, net in the condensed consolidated statements of operations.
During the first three months of 2024, we made required contributions of $280 million to our defined benefit pension plans.
American Airlines, Inc.  
Defined Benefit Plan Disclosure [Line Items]  
Employee Benefit Plans Employee Benefit Plans
The following table provides the components of net periodic benefit cost (income) (in millions):
 Pension BenefitsRetiree Medical and Other
Postretirement Benefits
Three Months Ended March 31,2024202320242023
Service cost$— $— $8 $3 
Interest cost180 189 17 12 
Expected return on assets(243)(228)(2)(3)
Amortization of:
Prior service cost (benefit)— 7 3 (3)
Unrecognized net loss (gain)27 27 (6)(9)
Net periodic benefit cost (income)$(36)$(5)$20 $— 
Effective November 1, 2012, substantially all of American’s defined benefit pension plans were frozen.
The service cost component of net periodic benefit cost (income) is included in operating expenses and the other components of net periodic benefit cost (income) are included in nonoperating other expense, net in the condensed consolidated statements of operations.
During the first three months of 2024, American made required contributions of $280 million to its defined benefit pension plans.