United Kingdom Iata Icao Name City First visit Flights LHR EGLL London Heathrow Airport London 1993-10-033 Oct 1993 1 LGW EGKK London Gatwick Airport London 1993-10-1515 Oct 1993 1 United States Iata Icao Name City First visit Flights ORD KORD Chicago O'Hare International Airport Chicago 1993-10-033 Oct 1993 2 IAH KIAH George Bush Intercontinental Houston Airport Houston 1993-10-033 Oct 1993 2 TUL KTUL Tulsa International Airport Tulsa 1993-10-077 Oct 1993 2 DFW KDFW Dallas Fort Worth International Airport Dallas-Fort Worth 1993-10-1515 Oct 1993 2