Question: Who did AMR Corporation merge with to form an American company headquartered in Fort Worth, Texas?

Context paragraphs:
AMR Corporation: AMR Corporation was a commercial aviation business and airline holding company based in Fort Worth, Texas, which was the parent company of American Airlines, American Eagle Airlines, AmericanConnection and Executive Airlines.  AMR filed for Chapter 11 bankruptcy in November 2011, and merged with US Airways Group on December 9, 2013 to form American Airlines Group, Inc.

Naval Air Station Joint Reserve Base Fort Worth: Naval Air Station Fort Worth Joint Reserve Base (or NAS Fort Worth JRB) (IATA: FWH, ICAO: KNFW, FAA LID: NFW) includes Carswell Field, a military airbase located 5 NM west of the central business district of Fort Worth, in Tarrant County, Texas, United States.  This military airfield is operated by the United States Navy Reserve.  It is located in the cities of Fort Worth, Westworth Village, and White Settlement in the western part of the Fort Worth urban area.

Fort Worth Spinks Airport: Fort Worth Spinks Airport (ICAO: KFWS, FAA LID: FWS) is a city owned, public use airport located 14 nautical miles (26 km) south of the central business district of Fort Worth, in Tarrant County, Texas, United States.  It is the newest of the three airports that are owned by the City of Fort Worth and it serves the cities of Fort Worth, Burleson, and Mansfield.  The airport is located at the intersection of Interstate 35W and HWY 1187 and serves as a reliever airport for Fort Worth Meacham International Airport and Dallas-Fort Worth International Airport.  It was one of few airports in the country to have Class E airspace and a control tower.  However, its airspace now has Class D designation.

Fort Worth Intermodal Transportation Center: The Fort Worth Intermodal Transportation Center (ITC) is an intermodal transit station in Fort Worth, Texas.  It serves Trinity Railway Express commuter rail, Amtrak intercity rail, and buses, and it planned to serve the TEXRail commuter system.  It is located at the corner of 9th and Jones Streets, on the east side of downtown Fort Worth.  TRE service began on December 3, 2001, serving the Fort Worth Convention Center, the Fort Worth Water Gardens, Sundance Square, Bass Performance Hall and Tarrant County government facilities.  Amtrak's "Texas Eagle" and "Heartland Flyer" serve the station.  The station also serves as the main bus transit hub for the Fort Worth Transportation Authority (known locally as "The T"), as well as Greyhound.  In the case of The T, before the ITC's opening, the main downtown transit hub for The T centered around bus lines all converging into a transit mall along the one-way couplet corridor of Houston Street and Throckmorton Street.

Fort Worth Airlines: Fort Worth Airlines was an airline headquartered at Meacham Field in Fort Worth, Texas, United States.  In 1985 the airline had been newly established.  It flew to Hobby Airport in Houston from Fort Worth and from Austin to San Antonio.  Fort Worth Airlines leased four NAMC YS-11s from Mid Pacific Air, which provided technical support for the aircraft.

Thomas W. Horton: Thomas W. Horton (born 05/24/1961) was the Chairman, President, and Chief Executive Officer of AMR Corporation until it merged with US Airways Group to form American Airlines Group, Inc. and was the Chairman of American Airlines Group, Inc. and American Airlines.  He also served as Chairman of oneworld, the global airline alliance, until March 2014.

Fort Worth Masonic Temple: The Fort Worth Masonic Temple is a Masonic Temple located at 1100 Henderson St, Fort Worth, Texas.  Completed in 1932, the building was designed by the architectural firm of Wiley G. Clarkson & Co, who also designed the Stripling Building, US Court House, Sinclair Building, and STS Tower in Fort Worth.  The building exhibits Neo-classical styling with Art moderne influences and features upper-story Ionic columns and monel alloy bas-relief doors.  It features two grand staircases at the main entrance which leads to a terrace.  The main doors depict the three Ancient Grand Masters of Masonic legend, King Solomon, Hiram, King of Tyre, and Hiram Abif.  The building still retains its Civil Defense Fallout Shelter sign which was placed there during the height of World War II.  The building became a recorded Texas historical landmark in 1984.  The Fort Worth Architecture website lists the structure as architecturally significant buildings in Downtown Fort Worth, and is included on their recommended walking tour of architecture of Fort Worth.

American Airlines Group: American Airlines Group, Inc. is an American publicly traded airline holding company headquartered in Fort Worth, Texas.  It was formed December 9, 2013, in the merger of AMR Corporation, the parent company of American Airlines, and US Airways Group, the parent company of US Airways.  The airline groups together form the largest airline in the world, with more than 6,700 daily flights to 336 locations in 56 countries worldwide, about $40 billion in operating revenue, over 100,000 employees, and plans to take delivery of 607 new aircraft, including 517 narrowbody aircraft and 90 widebody international aircraft.  The integration of American Airlines and US Airways was completed when the Federal Aviation Administration granted a single operating certificate for both carriers on April 8, 2015.

T&amp;P Station: Texas and Pacific Station, commonly known as T&P Station, is a Trinity Railway Express and under-construction TEXRail commuter railroad station located at 1600 Throckmorton Street in Fort Worth, Texas, on the south side of downtown.  It is the western terminus of the TRE commuter line, serving the Fort Worth Convention Center, the Fort Worth Water Gardens, Sundance Square and Tarrant County government facilities.  T&P Station features free parking (unlike the nearby Fort Worth ITC Station) which can be accessed from West Vickery Boulevard.

Haltom City, Texas: Haltom City is a city that is part of the Dallas-Fort Worth region and inside Tarrant County, Texas, United States.  The population was 42,409 at the 2010 census.  Haltom City is a inner suburb of Fort Worth, a principal city of the DFW Metroplex.  The city is 6 miles from Downtown Fort Worth, 30 miles from the American Airlines Center in Dallas, and 20 miles from the Dallas/Fort Worth International Airport in Irving.  Haltom is surrounded almost entirely by Fort Worth, North Richland Hills, Watauga, and Richland Hills.

Supporting paragraphs: Thomas W. Horton American Airlines Group
Answer: US Airways Group