Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Firm Commitments and Options to Purchase Aircraft and Summary of Commitments

As of December 31, 2023, United had firm commitments to purchase aircraft from The Boeing Company ("Boeing") and Airbus S.A.S. ("Airbus") presented in the table below:

		Contractual Aircraft Deliveries			Expected Aircraft Deliveries (b)
Aircraft Type	Number of Firm  Commitments (a)	2024	2025	After 2025	2024	2025	After 2025
787	150	8	18	124	7	18	125
737 MAX 8	43	43	—	—	37	6	—
737 MAX 9	34	34	—	—	19	15	—
737 MAX 10	277	80	71	126	—	(c)	(c)
A321neo	126	26	38	62	25	24	77
A321XLR	50	—	8	42	—	1	49
A350	45	—	—	45	—	—	45
(a)United also has options and purchase rights for additional aircraft. (b)Expected aircraft deliveries reflect adjustments communicated by Boeing and Airbus or estimated by United. (c)Due to the delay in the certification of the 737 MAX 10 aircraft, we are unable to accurately forecast the expected delivery period.

Summary of Commitments

The table below summarizes United's firm commitments as of December 31, 2023, which include aircraft and related spare engines, aircraft improvements and non-aircraft capital commitments. Aircraft commitments are based on contractual scheduled aircraft deliveries without any adjustments communicated by Boeing and Airbus or estimated by United.

(in billions)
2024	$	12.1
2025	7.9
2026	6.0
2027	4.5
2028	6.1
After 2028	23.5
	$	60.1