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): June 7, 2013

US AIRWAYS GROUP, INC.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (480) 693-0800

N/A

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

US AIRWAYS, INC.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (480) 693-0800

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:

On June 7, 2013, AMR Corporation, a Delaware corporation (“AMR”), US Airways Group, Inc., a Delaware corporation (“US Airways”), and AMR Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of AMR (“Merger Sub”), entered into a Second Amendment to Agreement and Plan of Merger (the “Second Amendment”), which amended that certain Agreement and Plan of Merger (as previously amended, the “Merger Agreement”), dated as of February 13, 2013, by and among AMR, US Airways and Merger Sub. The sole purpose of the Second Amendment is to make certain technical modifications to Sections 1.6(a) and 1.7(a) of the Merger Agreement and the related forms of Certificate of Incorporation and Bylaws to be applicable at the effective time of the merger.

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

(d) Exhibits

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. AMR Corporation (“AMR”) has filed with the Securities and Exchange Commission (“SEC”) a registration statement on Form S-4, which includes a proxy statement of US Airways Group, Inc. (“US Airways”) that also constitutes a prospectus of AMR, and US Airways has filed with the SEC its definitive proxy statement on Schedule 14A. AMR 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 AMR 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 AMR can be obtained free of charge on AMR’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.

US Airways, AMR and certain of their respective directors, executive officers and certain members of management may be deemed to be participants in the solicitation of proxies from the stockholders of US Airways in connection with the proposed transaction. Information about the directors and executive officers of US Airways is set forth in its Annual Report on Form 10-K/A, which was filed with the SEC on April 16, 2013, and the proxy statement/prospectus related to the proposed transaction. Information about the directors and executive officers of AMR is set forth in its Annual Report on Form 10-K/A, which was filed with the SEC on April 16, 2013, and the proxy statement/prospectus related to the proposed transaction. These documents can be obtained free of charge from the sources indicated above.

SIGNATURES

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

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

EXHIBIT INDEX