United Kingdom. 1979, May 19. 19-20 MAY 1979 ARMY ARMED FORCES PROTECTION DEFENSE OF THE COUNTRY'S AIR BORDERS. The release of the postal art envelope (HK), dedicated to the air show, the international aviation fair in Biggin Hill and demonstrations and flights of military aircraft, fighters, in particular, in Biggin Hill on May 19-20, 1979. The plot of the HK depicts a military pilot, a pilot in a military flight uniform, a hermoshlem, a jumpsuit with a parachute behind his shoulders, sitting in the cockpit (cockpit) of a fighter against the background of a supersonic military aircraft flying in the sky at a low altitude - a fighter. HK is franked with one standard postage stamp, cancelled with a special cancellation stamp (SG) on the occasion of the specified air show and fair and carried on the military aircraft "Sea Harrier XZ 450" (Sea Harrier XZ 450) with vertical takeoff and vertical landing during the preparatory flight to the holding of the specified air show, as evidenced by the inscription on the front side of the HK. HK contains a cardboard insert with the text in English with a detailed description of this issue and the topic to which it is devoted. HK with SG to commemorate the air show and fair, performances in Biggin Hill, carried on the specified military aircraft with vertical take-off and vertical landing. Condition - LUX.