Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Summary of Commitments to Purchase Aircraft

The table below summarizes United's commitments as of December 31, 2018, which primarily relate to the acquisition of aircraft and related spare engines, aircraft improvements and include other capital purchase commitments for the years ended December 31 (in billions). Any new firm aircraft orders, including through the exercise of purchase options and purchase rights, will increase the total future capital commitments of the Company.

2019	$	4.2
2020	5.3
2021	3.5
2022	2.8
2023	1.9
After 2023	7.0
	$	24.7

As of December 31, 2018, United had firm commitments and options to purchase aircraft from The Boeing Company ("Boeing"), Airbus S.A.S. ("Airbus") and Embraer S.A. ("Embraer") presented in the table below:

Aircraft Type	Number of Firm Commitments (a)
Airbus A350	45
Boeing 737 MAX	175
Boeing 777-300ER	4
Boeing 787	24
Embraer E175	25
(a) United also has options and purchase rights for additional aircraft.