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Tonight's aero stunt - changing planes, the hard way:

From the video's description:

For the Akte Blani(X) 2 project, skydiver Paul Steiner from the Red Bull Sky Dive Team and the Blanix Team complete another spectacular stunt. 2.100 meters above the ground, Steiner went out of the cockpit and walked on the wing, then transferred from one plane to the other. No belts, no tricks.