High Quality Content by WIKIPEDIA articles! London Heathrow Terminal 5 is an airport terminal at London Heathrow Airport, serving the British capital city of London. Opened in 2008, the main building in the complex is the largest free-standing structure in the United Kingdom. Terminal 5 is currently used exclusively as one of the three global hubs of International Airlines Group, served by British Airways and Iberia, with the others being London Gatwick North and Madrid Barajas Terminal 4. Prior to March 2012, the terminal was used exclusively by British Airways. The terminal is designed to ultimately handle 35 million passengers a year.