Issuer Free Writing Prospectus

Filed pursuant to Rule 433(d)

Registration No. 333-221865-01

Pricing Supplement

Dated May 9, 2018

United Airlines, Inc.

$225,729,000

2018-1 Pass Through Trust

Class B Pass Through Certificates, Series 2018-1

Pricing Supplement dated May 9, 2018 to the preliminary prospectus supplement dated May 9, 2018 relating to the Class B Certificates referred to below (as supplemented, the “Preliminary Prospectus Supplement”) of United Airlines, Inc. (“United”).

The information in this Pricing Supplement supplements the Preliminary Prospectus Supplement and supersedes the information in the Preliminary Prospectus Supplement to the extent inconsistent with the information in the Preliminary Prospectus Supplement.

Unless otherwise indicated, terms used but not defined herein have the meanings assigned to such terms in the Preliminary Prospectus Supplement.

Securities:	Class B Pass Through Certificates, Series 2018-1 (“Class B Certificates”)
Amount:	$225,729,000
CUSIP:	90932N AA1
ISIN:	US90932NAA19
Coupon:	4.600%
Make-Whole Spread over Treasuries:	0.30%
Maximum Commitment Amount Under Class B Liquidity Facility at May 23, 2018:	$15,575,301
Price to Public:	100%
Underwriters:
Credit Suisse Securities (USA) LLC	$49,669,000
Citigroup Global Markets Inc.	$49,669,000
Goldman Sachs & Co. LLC	$41,726,000
Deutsche Bank Securities Inc.	$34,167,000
Morgan Stanley & Co. LLC	$34,167,000
Barclays Capital Inc.	$2,333,000
Merrill Lynch, Pierce, Fenner & Smith                              Incorporated	$2,333,000
BNP Paribas Securities Corp.	$2,333,000
Credit Agricole Securities (USA) Inc.	$2,333,000
J.P. Morgan Securities LLC	$2,333,000
Standard Chartered Bank	$2,333,000

Wells Fargo Securities, LLC	$2,333,000
Concession to Selling Group Members:	0.50%
Discount to Broker/Dealers:	0.20%
Underwriting Commission:	$2,257,290
Settlement:	May 23, 2018 (T+10) closing date, the tenth business day after the date hereof.

The issuer has filed a registration statement (including a prospectus) with the SEC for the offering to which this communication relates. Before you invest, you should read the prospectus in that registration statement and other documents the issuer has filed with the SEC for more complete information about the issuer and this offering. You may get these documents for free by visiting EDGAR on the SEC Web site at www.sec.gov. Alternatively, the issuer, any underwriter or any dealer participating in the offering will arrange to send you the prospectus if you request it by calling Credit Suisse toll-free at 1-800-221-1037 or Citigroup at 1-877-858-5407.