Heathrow Terminal 5 is an airport terminal at Heathrow Airport (IATA: LHR, ICAO: EGLL), serving the UK 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.