20 August 1908 (USA) — The Wright Flyer built for flight trials before the United States Army arrives at Fort Meyer, near Washington, D.C., eight days ahead of schedule. Before trials begin, tests to check transportability, another stipulation, start.

20 August 1910 (USA) — The first United States Army experiments with firing a rifle from an airplane takes place when Lt. Jacob Earl Fickel conducts firing trials from a Curtiss biplane piloted by Curtiss himself.

20 August 1913 (France) — French aviator Adolphe Pégoud carries out the first parachute descent ever made whereby the parachute is deployed before the pilot leaves the airplane.

20 August 1919 (Germany) — The first regularly scheduled passenger service by airship begins in Berlin with a Zeppelin LX 120 Bodenese.