Aircraft lockheed sr 71 blackbird An aircraft is a machine that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines. Journal · 09 · 17+♥ 320 Last update at 17 · 09 · by milo ‧‧‧ One of 7755Aircraft More in Aircraft Home Aircraft lockheed sr 71 blackbird PIFTW