National Airlines was a United States airline that operated from 1934 to 1980. For most of its existence the company was headquartered at Miami International Airport, Florida. At its height, National Airlines had a network of "Coast-to-Coast-to-Coast" flights, linking Florida and the Gulf Coast with cities along the East Coast and large cities on the West Coast. From 1970 to 1978 National, Pan American World Airways (Pan Am) and Trans World Airlines (TWA) were the only U.S. airlines that operated scheduled passenger flights to Europe.