by the airline's invitation. After a passenger sued for discrimination, the club switched to a paid membership program in 1974. Flagship Lounge Though affiliated with the Admirals Club and staffed by many of the same employees, the Flagship Lounge is a separate lounge specifically designed for customers flying in first class and business class on international flights and transcontinental domestic flights, as well as AAdvantage Concierge Key, Executive Platinum, Platinum Pro, and Platinum, as well as Oneworld Emerald and Sapphire frequent flyers. As of May 2019, Flagship Lounges are located at five airports: New York–JFK, Chicago-O'Hare, Miami International, Los Angeles, and Dallas/Fort Worth. Flagship Lounges are planned for London-Heathrow and Philadelphia. Corporate affairs Ownership and structure American Airlines, Inc., is publicly traded through its parent company, American Airlines Group Inc., under NASDAQ: AAL , with a market capitalization of about $12 billion as of 2019, and is included in the S&P 500 index. American Eagle is a network of six regional carriers that operate under a codeshare and service agreement with American, operating flights to destinations in the United States, Canada, the Caribbean, and Mexico. Three of these carriers are independent and three are subsidiaries of American Airlines Group: Envoy Air Inc., Piedmont Airlines, Inc., and PSA Airlines Inc. Headquarters American Airlines is headquartered across several buildings in Fort Worth, Texas that it calls the "Robert L. Crandall Campus" in honor of former president and CEO Robert Crandall. The square-foot, five-building office complex called was designed by Pelli Clarke Pelli Architects. The campus is located on 300 acres, adjacent to Dallas/Fort Worth International Airport, American's fortress hub. Before it was headquartered in Texas, American Airlines was headquartered at 633 Third Avenue in the Murray Hill area of Midtown Manhattan, New York City. In 1979, American moved its headquarters to a site at Dallas/Fort Worth International Airport, which affected up to 1,300 jobs. Mayor of New York City Ed Koch described the move as a "betrayal" of New York City. American moved to two leased office buildings in Grand Prairie, Texas. On January 17, 1983, the airline finished moving into a $150 million ($ when adjusted for inflation), facility in Fort Worth; $147 million (about $ when adjusted for inflation) in Dallas/Fort Worth International Airport bonds financed the headquarters. The airline began leasing the facility from the airport, which owns the facility. Following the merger of US Airways and American Airlines,