NOT through the tunnel. OMG, I think I p'ed myself!
Okay Mikey, here's the challenge.
Let's (collective used loosely) twist up an ultralight - no numbers - and see who flies it under the Sebastian Inlet bridge first.
BwaaHaaHaa ...
I dont think the video is fake at all. It looks like original footage to me, and the way the camera is manuvered, would be impossible with a model airplane and model helicopters didn't exist back then, capable of flying a heavy camera around.
Probably a promotional film spliced together from several different flights. Notice the pilot (the real one) wears dark pants in some flights and white in others and keeps his face mostly away from the camera on the flybys. . The kid (actor) is either a passenger on some flights or is dubbed in Hollywood style seated in front of the actual footage screen.
Nevertheless it is great vintage filming from a Hughes 269 . Makes me want to visit Rio de Janeiro. Nice countryside and beaches.