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Operating Leases (Tables)
 6 Months Ended
Jun. 30, 2025
Leases [Abstract]  
Schedule of Lease Costs
The table below presents certain information related to lease costs for operating leases during the three and six months ended June 30, 2025 and 2024 (in millions):
Three Months Ended June 30,Six Months Ended June 30,
2025202420252024
Operating lease cost(a)
$181 $155 $362 $302 
Variable lease cost(a)
122 94 226 173 
Total lease costs$303 $249 $588 $475 
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(a)    Expenses are included within aircraft rent, station operations, maintenance, materials and repairs and other operating within the Company’s condensed consolidated statements of operations.