Yeah, I suspect they wouldn’t get in it if there is a possibility it would run out of air at night!
Still, at 100,000 feet on a cloudy night and day, how far would they drop?
The plane that got to 100,000 feet was unmanned. They'd have to wear space suits to be that high and they don't have the power to haul all the necessary life support equipment. Also the wings were a lot longer on the 100,000 plane.