1938 NIAI RK-I extending wing fighter plane.
More: https://en.wikipedia.org/wiki/NIAI_RK-I
Previously:
1950s fighter jet bomber wingtip coupling experiments - photo and video
Parallel parking a fighter jet on an aircraft carrier - GIF
Russian paratroopers sliding off of airplane wings - GIF and video
NASA technology to fold airplane wings in flight - video
Riout 102T Alérion Ornithopter flapping wing airplane - photo
wing snaps off plane, whole-plane parachute deploys safely
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