John Wayne Airport technically only has one main passenger terminal building named the Thomas F. Riley Terminal. However, this terminal is split into three separate terminal areas, titled A–C.
Terminal A
Terminal A was built in 1990 and, along with Terminal B, replaced the Eddie Martin Terminal, which was closed when the Thomas F. Riley terminal was built. Terminal A has the ticket counters for American Airlines, Delta Air Lines and WestJet. Terminal A also features the American Airlines Admirals Club lounge.
Terminal B
Terminal B opened at the same time as Terminal B when the two terminals replaced the previous Eddie Martin Terminal. Terminal B has the ticket counters for Alaska Airlines and United Airlines, as well as the United Airlines United Club lounge.
Terminal C
Terminal C opened in 2011 and has a variety of shops and restaurants that are exclusive to the terminal. Terminal C also has the ticket counters for Frontier and Southwest but doesn't have any airport/airline lounges.