I don't know if this is the same guy, but a year or so ago a friend sent me a youtube clip of a French guy who was doing the same bit. The procedure was more amazing than the flight. First you bail out of the plane, then you get yourself oriented in the proper position,then you push the button to start up the jet engine, then ,( with a little luck it starts) you're off and running at 200 mph plus.
I used to have a reputation for doing a lot of crazy stuff that no one else would do, but when I see something like this I feel incredibly outclassed
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Rick