UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 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): September 20, 2013

AMR Corporation

(Exact name of registrant as specified in its charter)

(817) 963-1234

(Registrant’s telephone number)

N/A

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

American Airlines, Inc.

(Exact name of registrant as specified in its charter)

(817) 963-1234

(Registrant’s telephone number)

N/A

(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:

Introductory Note

As previously reported, on November 29, 2011, AMR Corporation (“AMR” or the “Company”), its principal subsidiary, American Airlines, Inc. (“American”) and certain of the Company’s other direct and indirect domestic subsidiaries, filed voluntary petitions for relief under Chapter 11 of the United States Bankruptcy Code in the United States Bankruptcy Court for the Southern District of New York.

On February 13, 2013, AMR, US Airways Group, Inc. (“US Airways”), and AMR Merger Sub, Inc., a wholly owned subsidiary of AMR (“Merger Sub”), entered into an Agreement and Plan of Merger (as amended, the “Merger Agreement”), which contemplates the merger of Merger Sub with and into US Airways, with US Airways surviving as a wholly-owned subsidiary of the Company (the “Merger”).

On September 20, 2013, AMR, US Airways and Merger Sub entered into a Third Amendment to the Merger Agreement (the “Third Amendment”). The Third Amendment extends the date on which either AMR or US Airways may terminate the Merger Agreement to the earlier of (A) the later of (i) January 18, 2014 and (ii) the fifteenth (15) day after the United States District Court for the District of Columbia (the “District Court”) enters an order in the trial in the proceeding captioned United States of America, et al. v. US Airways Group, Inc. and AMR Corporation (the “Trial”) in favor of American and US Airways, provided that such order is entered on or prior to January 17, 2014, and (B) five (5) days after the District Court enters a final, but appealable, order permanently restraining, enjoining or otherwise prohibiting consummation of the Merger following the Trial.

The Third Amendment also amends the definition of “Plan” in the Merger Agreement to specifically exclude as a condition to the effectiveness of the Plan that certain Letter Agreement, dated as of February 13, 2013, among AMR, American and Thomas W. Horton.

The foregoing description of the Third Amendment is qualified in its entirety by reference to the Third Amendment, which is filed as Exhibit 2.1 hereto and is incorporated herein by reference.

Additional Information and Where to Find It

This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval. The Company has filed with the Securities and Exchange Commission (“SEC”) a registration statement on Form S-4, which includes a proxy statement of US Airways that also constitutes a prospectus of the Company, and US Airways has filed with the SEC its definitive proxy statement on Schedule 14A. The Company and US Airways have mailed the proxy statement/prospectus to US Airways security holders. INVESTORS AND SECURITY HOLDERS OF US AIRWAYS ARE URGED TO READ THE PROXY STATEMENT/PROSPECTUS AND OTHER RELEVANT DOCUMENTS FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION. Investors and security holders may obtain free copies of the proxy statement/prospectus and other documents containing important information about the Company and US Airways through the website maintained by the SEC at http://www.sec.gov. Copies of the documents filed with the SEC by US Airways can be obtained free of charge on US Airways’ website at www.usairways.com or by directing a written request to US Airways Group, Inc., 111 West Rio Salado Parkway, Tempe, Arizona 85281, Attention: Vice President, Legal Affairs. Copies of the documents filed with the SEC by the Company can be obtained free of charge on the Company’s website at www.aa.com or by directing a written request to AMR Corporation, P.O. Box 619616, MD 5675, Dallas/Fort Worth International Airport, Texas 75261-9616, Attention: Investor Relations or by emailing investor.relations@aa.com.

Cautionary Statement Regarding Forward-Looking Statements and Information

This document includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements may be identified by words such as “may,” “will,” “expect,” “intend,” “anticipate,” “believe,” “estimate,” “plan,” “project,” “could,” “should,” “would,” “continue,” “seek,” “target,” “guidance,” “outlook,” “forecast” and other similar words. These forward-looking statements are based on the Company’s and US Airways’ current objectives, beliefs and expectations, and they are subject to significant risks and uncertainties that may cause actual results and financial position and timing of certain events to differ materially from the information in the forward-looking statements. The following factors, among others, could cause actual results and financial position and timing of certain events to differ materially from those described in the forward-looking statements: the challenges and costs of the proposed transaction, including integrating operations and achieving anticipated synergies; the price of, market for and potential market price volatility of common stock of the ultimate parent entity following the closing of the proposed transaction; significant liquidity requirements and substantial levels of indebtedness of the combined company following the closing; potential limitations on the use of certain tax attributes following the closing; failure of the proposed transaction to be completed; and other economic, business, competitive, and/or regulatory factors affecting the business of the combined company after the closing and the businesses of US Airways and the Company generally, including those set forth in the filings of US Airways and the Company with the SEC, especially in the “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” sections of their respective annual reports on Form 10-K and quarterly reports on Form 10-Q, their current reports on Form 8-K and other SEC filings, including the registration statement and the proxy statement/prospectus related to the proposed transaction. Any forward-looking statements speak only as of the date hereof or as of the dates indicated in the statements. Neither the Company nor US Airways assumes any obligation to publicly update or supplement any forward-looking statement to reflect actual results, changes in assumptions or changes in other factors affecting these forward-looking statements except as required by law.

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.

Dated: September 23, 2013

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.

Dated: September 23, 2013

Exhibit Index