18 June 1940 : The last deployed element of the RAF’s Advanced Air Striking Force – some Hurricane fighters – withdraws from France and the Channel Islands to the United Kingdom.
18 June 1939 : The first direct transatlantic seaplane service is begun by Pan American Airways. It flies from New York to Southampton, England, by way of Botwood, Newfoundland, and Foynes, Ireland.
18 June 1937 : First flight of the de Havilland Don
18 June 1937 : June 18-20, Valery Chkalov, G. F. Baidukov, A. V. Belyakov flew from Moscow to Vancouver, Washington, USA via the North Pole.
18 June 1935 : The Seversky SEV-2XP is heavily damaged (perhaps intentionally) while en route to Wright Field, Ohio, for the 1935 U.S. Army Air Corps competition for a new single-seat fighter. The two-seat design is reworked into a single-seater with retractable undercarriage when the Air Corps delays the competition until April 1936.
18 June 1932 : First flight of the Dewoitine D.500
18 June 1928 : A Latham 47 flying boat carrying Norwegian polar explorer Roald Amundsen and five others on a flight to search for survivors of the Italian airship Italia disappears. Their bodies are never found.
18 June 1926 : First flight of the Blackburn Iris
18 June 1922 : The first soaring flight of one hour in slope lift (using hill currents) is made by Arthur Martens in a Vampyr sailplane designed by Wolfgang Klemmperer at the Wasserkuppe, Rhon, Germany.
18 June 1920 : The first aircraft were taken on strength by the Canadian Air Force. They were four Avro 504 ks, registered G-CYAA to G-CYAD.
18 June 1916 : First German ace Max Immelmann (17 victories) is killed at ~2215 hrs. when his Fokker E.III monoplane, 246-16, crashes after breaking up in the air when the interrupter gear malfunctions and he shoots away his own propeller. He had been engaging an F.E.2b piloted by 2nd Lt. G. R. Gubbin with Cpl. J. H. Waller as gunner. Gubbin and Waller were credited with the victory, but another theory posits that Immelmann may have taken hits from friendly AAA, as the propeller failure would not necessarily have caused the complete airframe disintegration that occurred.
18 June 1877 : Samuel Archer King makes a two-hour airmail flight of 26 miles between Nashville and Gallatin, Tennessee, in the balloon Buffalo.
18 June 1861 : Thaddeus S. C. Lowe transmits the first telegraphic message ever sent from a balloon during a test at the Columbia Armory, Washington, D. C.