Supplemental Agreement No. 5 to Purchase Agreement No. 03776 between The Boeing Company and United Airlines, Inc. Relating to Boeing Model 737-9 Aircraft

Exhibit 10.1

CONFIDENTIAL MATERIAL APPEARING IN THIS DOCUMENT HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION IN ACCORDANCE WITH THE SECURITIES ACT OF 1933, AS AMENDED, AND RULE 24B-2 PROMULGATED THEREUNDER. OMITTED INFORMATION HAS BEEN REPLACED WITH ASTERISKS.

Supplemental Agreement No. 5

to

Purchase Agreement No. 03776

between

The Boeing Company

and

United Airlines, Inc.

Relating to Boeing Model 737-9 Aircraft

THIS SUPPLEMENTAL AGREEMENT, entered into as of January 20, 2016, by and between THE BOEING COMPANY (Boeing) and UNITED AIRLINES, INC. (Customer);

WHEREAS, the parties hereto entered into Purchase Agreement No. 03776 dated July 12, 2012, as amended and supplemented (Purchase Agreement), relating to the purchase and sale of Boeing model 737-9 aircraft (Aircraft). This Supplemental Agreement is an amendment to the Purchase Agreement;

WHEREAS, Boeing and Customer agree to *** 737-9 aircraft as *** Aircraft to the Purchase Agreement.

NOW THEREFORE, in consideration of the mutual covenants herein contained, the parties agree to amend the Purchase Agreement as follows:

The “Table of Contents” is deleted in its entirety and replaced with the attached “Table of Contents” (identified by “SA-5”).

“Attachment A to Letter Agreement No. UCH-PA-03776-LA-1207644” is deleted in its entirety and replaced with the attached “Attachment A to Letter Agreement No. UCH-PA-03776-LA-1207644” (identified by “SA-5”).

The Purchase Agreement will be deemed supplemented to the extent provided herein as of the date hereof and as so supplemented will continue in full force and effect.

Supplemental Agreement No. 5 to

Purchase Agreement No. 03776

EXECUTED IN DUPLICATE as of the day and year first written above.

TABLE OF CONTENTS

TABLE OF CONTENTS, CONTINUED

Attachment A to Letter Agreement No. UCH-PA-03776-LA-1207644

737-9 *** Aircraft Delivery, Description, Price and ***

Note: The estimated Advance Payment Base Prices have been calculated using a *** and *** as follows: