Question: What is the American Airlines Group that's headquartered in Irving, Texas?

Context paragraphs:
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.

Piedmont Airlines: Piedmont Airlines, Inc. is an American regional airline operating for American Eagle, formerly US Airways Express.  It is a wholly owned subsidiary of the American Airlines Group, headquartered in unincorporated Wicomico County, Maryland, near the city of Salisbury.  It conducts flight operations using Bombardier Dash 8, and Embraer ERJ 145 aircraft.  Piedmont Airlines, Inc. also provides ground handling and customer service for airports in the Northeastern & Western parts of the United States.  Its main base is Philadelphia International Airport with hubs in Charlotte Douglas International Airport.

Envoy Air: Envoy Air Inc. (formerly American Eagle Airlines) is an air carrier headquartered in Irving, Texas, in the Dallas-Fort Worth metroplex.  It is a wholly owned subsidiary of American Airlines Group that, along with several carriers outside the group, feeds the American Airlines route network under the American Eagle brand.  With over 1,800 flights a day, serving 159 cities across the United States, Canada, Mexico and the Caribbean, Envoy is considered to be the world's largest regional airline system.  Envoy is an affiliate member of the Oneworld airline alliance.

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.

Lockwood v. American Airlines, Inc.: Lockwood v. American Airlines, Inc, 107 F.3d 1565 (Fed Cir.  1997) was a case for the United States Court of Appeals for the Federal Circuit in which Lawrence B. Lockwood sued American Airlines, Inc for patent infringement for their reservation system, SABREvision.  The case was first heard by the United States District Court for the Southern District of California, which ruled in favor of American Airlines, Inc.  In the summary judgment for that case, the court ruled that American Airlines, Inc’s SABREvision system did not infringe on U.S. Patent Re.  32,115, U.S. Patent 4,567,359, and U.S. Patent 5,309,355 held by Lockwood.  Furthermore, the court ruled that the ‘355 patent was invalid under 35 U.S.C. § 102 and the asserted claims of the ‘359 patent were invalid under 35 U.S.C. § 103.  The Court of Appeals for the Federal Circuit upheld these rulings in favor of American Airlines, Inc. based on the fact that district court determined there were no genuine issues of material fact in dispute.

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.

PSA Airlines: PSA Airlines, Inc. is an American regional airline headquartered at Dayton International Airport in Vandalia, Ohio, that flies under the American Eagle brand for American Airlines.  PSA is a wholly owned subsidiary of American Airlines Group.  PSA has crew bases in Washington, D.C.; Knoxville, Tennessee; Charlotte, North Carolina; Cincinnati, Ohio; and Dayton, Ohio.  It has maintenance bases in Charlotte, North Carolina; Cincinnati, Ohio; Dayton, Ohio and at the Akron–Canton Airport in Green, Ohio.

Pedro Fábregas: Pedro Fábregas (born 12 April 1965) is an officer at American Airlines Group, the parent company of American Airlines, US Airways and Envoy Air.  Pedro Fábregas was named president and chief executive officer of Envoy Air Airlines in December 2013.  At Envoy Air, Fábregas oversees one of the world's largest regional airlines, with more than 14,000 employees and operating more than 220 regional aircraft on approximately 1,400 daily flights to nearly 150 cities throughout the United States, Canada, the Bahamas, Mexico and the Caribbean.

American Eagle (airline brand): American Eagle is an American brand name for the regional branch of American Airlines, under which ten individual regional airlines operate short- and medium-haul feeder flights.  Three of these airlines, Envoy Air (formerly American Eagle Airlines), Piedmont Airlines and PSA Airlines, are wholly owned subsidiaries of American Airlines Group.  Just like the regional brands of the other two major airlines (Delta Connection and United Express), American Airlines' regional brand accounts for more than 60% of American Airlines flights.

Doug Parker: William Douglas "'Doug" Parker is an American businessman who is the current Chairman and CEO of American Airlines Group, Inc., the parent company of American Airlines.

Supporting paragraphs: Pedro Fábregas Envoy Air
Answer: Envoy Air