American Airlines Group, Inc. is a holding company, which engages in the operation of a network carrier through its principal wholly owned mainline operating subsidiary, American. The company is headquartered in Fort Worth, Texas and currently employs 133,300 full-time employees. The company went IPO on 2013-12-09. Its primary business activity is the operation of a major network air carrier, providing scheduled air transportation for passengers and cargo through its hubs in Charlotte, Chicago, Dallas/Fort Worth, Los Angeles, Miami, New York, Philadelphia, Phoenix and Washington, D.C. and partner gateways, including in London, Doha, Madrid, Seattle/Tacoma, Sydney and Tokyo, among others. Together with its regional airline subsidiaries and third-party regional carriers operating as American Eagle. Its cargo division provides a wide range of freight and mail services, with facilities and interline connections available across the globe. The company operates approximately 977 mainline aircraft supported by its regional airline subsidiaries and third-party regional carriers, which together operate an additional 585 regional aircraft. Its subsidiaries include American Airlines, Inc., Envoy Aviation Group Inc., PSA Airlines, Inc. and Piedmont Airlines, Inc.