Exhibit 21

United Continental Holdings, Inc. and United Airlines, Inc. Subsidiaries

(as of February 28, 2019)

Entity					Jurisdiction of Incorporation
United Continental Holdings, Inc.					Delaware
Wholly-owned subsidiaries*:
United Airlines, Inc.					Delaware
	● Air Wis Services, Inc.				Wisconsin
		● Air Wisconsin, Inc.			Delaware
		● Domicile Management Services, Inc. **			Delaware
	● Air Micronesia, LLC.				Delaware
	● CAL Cargo, S.A. de C.V.**				Mexico
	● CALFINCO Inc.				Delaware
	● Century Casualty Company				Vermont
	● Continental Airlines de Mexico, S.A.**				Mexico
	● Continental Airlines Domain Name Limited				England
	● Continental Airlines Finance Trust II				Delaware
	● Continental Airlines Fuel Purchasing Group, LLC				Delaware
	● Continental Airlines, Inc. Supplemental Retirement Plan for Pilots Trust Agreement				Delaware
	● Continental Airlines Purchasing Holdings LLC				Delaware
		● Continental Airlines Purchasing Services LLC**			Delaware
	● Continental Express, Inc.				Delaware
	● Covia LLC				Delaware
	● Mileage Plus Holdings, LLC				Delaware
		● MPH I, Inc.			Delaware
			●Mileage Plus Marketing, Inc.		Delaware
		● Mileage Plus, Inc.			Delaware
	● Presidents Club of Guam, Inc.				Delaware
	● UABSPL Holdings, Inc.				Delaware
	● UAL Benefits Management, Inc.**				Delaware
	● United Atlantic LP**				Delaware
		● United Atlantic Services C.V.**			Netherlands
			●United Atlantic Corporate LLC		Delaware
			●United Atlantic Corporate Center C.V.**		Netherlands
				● United Atlantic Finance	Cayman Islands
	● United Atlantic B.V.				Netherlands
	● United Atlantic Services LLC				Delaware
	● United Aviation Fuels Corporation				Delaware
	● United Airlines Business Services Private Limited**				India
	● United Ground Express, Inc.				Delaware
	● United Travel Services, LLC				Delaware
	● United Vacations, Inc.				Delaware

*Subsidiaries of United Continental Holdings, Inc. are wholly owned unless otherwise indicated

**Domicile Management Services Inc. is 99.9% owned by Air Wis Services, Inc. and 0.1% owned by United Airlines, Inc. CAL Cargo, S.A. de C.V. is 99.99% owned by United Airlines, Inc. and .01% owned by CALFINCO Inc. Continental Airlines de Mexico, S.A. is 99.9997% owned by United Airlines, Inc. and .0003% owned by private entities. Continental Airlines Purchasing Services LLC is 99% owned by Continental Airlines Purchasing Holdings LLC and 1% owned by United Airlines, Inc. UAL Benefits Management, Inc. has 100% of its Class A Common Stock owned by United Airlines, Inc. and 100% of its Class B Common Stock owned by Health Care Services Corporation. United Atlantic LP is 99.9% owned by United Airlines, Inc. and 0.1% owned by United Atlantic Services LLC. United Atlantic Services C.V. is 99.9% owned by United Atlantic LP and 0.1% owned by United Atlantic Services LLC. United Atlantic Corporate Center C.V. is 99.9% owned by United Atlantic Services C.V. and 0.1% owned by United Atlantic Corporate LLC. United Airlines Business Services Private Limited is 99.99% owned by United Airlines, Inc. and 0.01% owned by UABSPL Holdings, Inc. on behalf of United Airlines, Inc.