The Wright brothers - Wilbur and Orville Wright - flew the world's first powered aircraft at Kitty Hawk, North Carolina, on 17th December 1903, and in the process changed the world as we know it. Their aircraft was the Wright Flyer, or the Flyer 1.
The brothers then went on to design better and more controllable aircraft, and also influenced the development of flight around the world. The Wright Flyer has been depicted on numerous stamps from all countries, and continues to be a very popular image for stamps commemorating key dates and events in the history of flight.
The original Wright Flyer is on permanent display at the Smithsonian Air and Space Museum in Washington DC.
The first powered, controlled, sustained airplane flight in history. Orville Wright, age 32, is at the controls of the machine, lying prone on the lower wing with hips in the cradle which operated the wing-warping mechanism. His brother, Wilbur Wright, age 36, ran alongside to help balance the machine, having just released his hold on the forward upright of the right wing. The starting rail, the wing-rest, a coil box, and other items needed for flight preparation are visible behind the machine. (Orville Wright preset the camera and had John T. Daniels squeeze the rubber bulb, tripping the shutter.)
Source : Wikipedia
Source : Smithsonian Air and Space Museum website
Gibraltar 2003 SG 1045
Hungary 1991 SG 4041, Scott 3301
India 1978 SG 905
Isle of Man 2016 150th anniv of Royal Aero Society (77p)
Marshall Islands 1996 SG 810, Scott 627
Marshall Islands 2001 SG 1709
Papua New Guinea 2003 SG MS987, Scott 1088 #b
Papua New Guinea 2003 SG MS987, Scott 1088 #c
Papua New Guinea 2003 SG MS987, Scott 1088 #d
Papua New Guinea 2003 SG MS988, Scott 1089
USA 1928 SG 652, Scott 649
USA 1949 Scott C45
USA 1978 Scott C91
USA 1978 Scott C92
USA 1997 SG 3305, Scott 3142 (part of sheet)
USA 1998 SG 3383, Scott 3182
USA 1998 SG 4285, Scott 3783
1. Wikipedia entry - Wright Flyer.
2. Wright Brothers virtual museum