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World's Longest Wingsuit Proximity Flight | Mont Blanc, France
(www.youtube.com)
Usually, when you pop into a youtube video, you can see where the meat is by all the most watched parts. This one just shows 521k clenched anuses watching the whole thing :P
I can't say for sure, since they were trying to go for a distance record it's possible they were using some form of ground effect to increase the distance on the run. When you travel at a high rate of speed with a wing over a surface, If multiplies the lift force of it.