High Quality Content by WIKIPEDIA articles! The de Havilland DH.110 Sea Vixen was a twin boom 1950s 1960s British two-seat jet fighter of the Fleet Air Arm (the air component of the Royal Navy) designed by de Havilland. Developed from an earlier first generation jet fighter, the Sea Vixen was a capable carrier-based fleet defence fighter that served into the 1970s. Initially produced by de Havilland it was later known as the Hawker Siddeley Sea Vixen when de Havilland became a part of the Hawker Siddeley group.