The only real limit for jet airplanes is the amount of air available for the engines to maintain compression, combustion, and thrust. Once the air becomes too thin, the aircraft can't go any higher under its own power.
To be an airplane with jet engines? All jet airplanes leave contrails.
Yes.
they fly
Air
Gravity.
five jet
The jet stream regularly affects high altitude wind and low altitude weather.
From 28,000 to 33,000 feet.
36,000 feet
jet streams
fluorecent orange
No