Given that a helicopter at that speed is a clear hazard to anyone below it and will blow a person below it off their feet, and could easily be pushed around or into the ground at any time (sudden gusts of winds do happen, although I have no real experience with helicopters so I may be wrong on some specifics), that is through.

"the park" includes not only the ground, but also a certain area above the ground - otherwise someone riding a bike through the park wouldn't be in the park (as they are not touching the ground) but their bike would be. That would be absurd.