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COMMITMENTS, CONTINGENCIES, AND GUARANTEES (Tables)
9 Months Ended
Sep. 30, 2025
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Commitments The table below summarizes United's firm commitments as of September 30, 2025, which include aircraft and related spare engines, aircraft improvements and non-aircraft commitments (in billions):
Last Three Months of 20252026202720282029After 2029Total
Purchase commitments$4.6 $7.8 $5.1 $6.4 $8.1 $22.4 $54.3