UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 16, 2009

UAL CORPORATION

UNITED AIR LINES, INC.

(Exact name of registrant issuer as specified in its charter)

Registrant’s telephone number, including area code: (312) 997-8000

(Former name or former address if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Item 1.01.   Entry into a Material Definitive Agreement.

On November 16, 2009, UAL Corporation (the “Company”) and United Air Lines, Inc. (“United”) entered into an underwriting agreement (the “Underwriting Agreement”) with J.P. Morgan Securities Inc., Morgan Stanley & Co. Incorporated and Goldman, Sachs & Co., on behalf of the underwriters (collectively, the “Underwriters”), and JPMorgan Chase Bank, N.A., as depositary, in connection with the issuance and sale of a total of $810,337,000 of United Air Lines, Inc. Pass Through Certificates, Series 2009-2 (the “Certificates”). The Company and United expect that delivery of the Certificates will be made under the Underwriting Agreement on or about November 24, 2009 in two different series, comprised of $697,731,000 of Class A certificates with a coupon of 9.75% per annum and $112,606,000 of Class B certificates with a coupon of 12.0% per annum. Each class of Certificates will be issued by a different pass through trust.

The Company intends to use the net proceeds from this offering to repay at par all of the $493 million aggregate principal amount (including accrued interest) related to United’s outstanding 2000-2 EETC and expects to use the remaining net proceeds of approximately $290 million, after accounting for all transaction-related fees and expenses, for general corporate purposes. The payment obligations of United under the equipment notes will be fully and unconditionally guaranteed by the Company.

The Certificates are being offered pursuant to the Prospectus Supplement, dated November 16, 2009, to the Prospectus, dated June 19, 2007, which forms a part of the Company’s and United’s automatic shelf registration statement on Form S-3 (Registration No. 333-143865) (the “Registration Statement”), filed with the Securities and Exchange Commission on June 19, 2007.

The foregoing description of the Underwriting Agreement is qualified in its entirety by reference to the agreement, a copy of which is filed herewith as Exhibit 1.1 and is incorporated by reference herein. The Underwriting Agreement is hereby incorporated by reference into the Registration Statement.

The Underwriters or their affiliates have from time to time provided and/or may in the future provide investment banking, commercial banking and financial advisory services to the Company, for which they have received or will receive customary compensation.

Item 7.01.   Regulation FD Disclosure.

On November 16, 2009, United issued a press release announcing the pricing of the offering of the Certificates.

The information in this Item 7.01, including Exhibit 99.1, is being furnished and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section and shall not be deemed incorporated by reference into any registration statement or other document filed pursuant to the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such filing.

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Item 9.01.   Financial Statements and Exhibits.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: November 16, 2009

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EXHIBIT INDEX

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