Here You can find a list of airlines which operated in Belfast City airport.
Paris Charles de Gaulle - Delta
Birmingham International - British
Cardiff Wales - Eastern Airways
Leeds Bradford - British
London City - British
Manchester - British, Aer Lingus
Southampton - Eastern Airways
London Heathrow - British, American Airlines, Aer Lingus, Iberia, Japan Airlines, Qantas, QatarAirways, Malaysia Airlines, Kenya Airways, LAN Airlines
Amsterdam Schiphol - Delta, KLM Royal, AirFrance, Kenya Airways, Virgin Atlantic
Edinburgh - Aer Lingus
Glasgow International - British