Based in Downtown Houston , Texas , it is the fourth - largest airline in the US based on revenue passenger miles .
Continental Airlines ( IATA : CO , ICAO : COA , Call sign : CONTINENTAL ) is a United States certificated air carrier .
Based in Downtown Houston , Texas , Continental Airlines is the fourth - largest CONTINENTAL in the United States based on revenue passenger miles .
Continental Airlines ( IATA : CO , ICAO : COA , Call sign : CONTINENTAL ) is a United States certificated air carrier .