Pressurization keeps the people alive.
Plains don't fly - plains are flat land areas. Planes fly.
fuel
Gravity and aerodynamic resistance.
Cirrus clouds only form at high levels, so jet plaanes fly at super high levels.
the right amount of water to put in a bottle rocket so it will fly high is 70 milliliters
If they are in the air so the answer is no, because if planes fly at high altitude and at high speed. It makes it alot difficult to get planes shot down.
Planes fly high to get above the weather, and to avoid air traffic. For jet planes, certain altitudes, all quite high, afford more efficient flight conditions.
Normal planes go at 40,500 feet from ground.
30000
Around 11km
They can fly but they have a high chance of getting damaged.
Fly is so cool they fly from flight At great height there is little atmospheric disturbance, so planes do not get buffeted and the flight is smoother.
High-speed fighter planes have aerofoil-shaped wings.
M.I.A. Paper Planes Fly like paper get high like planes
Of course, planes can fly.
Planes are not perfect but they are not the worst to fly in because it can be safe but it cant be sometimes most of the time it is great to fly in so most of the time planes are safe.
I said it is a Astronomer