Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Firm Commitments and Options to Purchase Aircraft and Summary of Commitments

As of March 31, 2021, United had firm commitments and options to purchase aircraft from The Boeing Company ("Boeing"), Airbus S.A.S. ("Airbus") and Embraer S.A. ("Embraer") as presented in the table below:

		Scheduled Aircraft Deliveries
Aircraft Type	Number of Firm  Commitments (a)	Last Nine Months of 2021	2022	After 2022
Airbus A321XLR	50	—	—	50
Airbus A350	45	—	—	45
Boeing 737 MAX	180	13	40	127
Boeing 787	9	9	—	—
Embraer E175	4	4	—	—
(a) United also has options and purchase rights for additional aircraft.

Summary of Commitments

The table below summarizes United's commitments as of March 31, 2021, which include aircraft and related spare engines, aircraft improvements and all non-aircraft capital commitments (in billions):

Last nine months of 2021	$	4.0
2022	2.9
2023	2.8
2024	1.7
2025	2.1
After 2025	10.2
	$	23.7

Based on these assumptions as of March 31, 2021, our estimated future payments through the end of the terms of our CPAs are presented in the table below (in billions):

Last nine months of 2021	$	1.6
2022	2.1
2023	1.9
2024	1.7
2025	1.4
After 2025	3.7
	$	12.4