In 1946 passenger flights on National Airlines and Eastern Air Lines began at the now civil Orlando Municipal Airport. Five years later the airport built its main terminal, a two-story structure with a built-in control tower; this terminal building stood until late 1999. The April 1957 Official Airline Guide shows 20 weekday departures: 14 Eastern and 6 National. Eastern Air Lines had a nonstop flight to Atlanta; no other nonstops left the state. The nonstops to Washington that began in 1959 were probably the longest ORL ever had.