If one were to fly a paper airplane at the Dead Sea (400 meters below sea level) and another identical paper airplane at the peak of Mount Everest (8800 meters above sea level) would there be any noticeable effects on the flight of the airplane? Assume still air with no thermals and flight far from surfaces such as the ground of rock formations.
The effects I'm interested in are the differences in air pressure and temperature on the flight of a conventional paper airplane. Would humidity affect this as well? I've heard of how Reynolds number affects paper airplanes differently than jet airliners, and this number seems to depend on properties of the air as well as properties of the airplane.
Note that this question was translated into English by my father, who is the one typing it. I'm thirteen years old and I don't use SE unsupervised.