The Hawker Siddeley HS 121 Trident (originally the de Havilland D.H.121 and the Airco DH 121) was a British short- (and later medium-) range airliner.
O Hawker Siddeley HS 121 Trident (orixinalmente de Havilland D.H.121 e Airco DH 121) foi un avión de pasaxeiros británico de curto e medio alcance.