Usually in the wings.
Boeing Commercial Airplanes was created in 1916.
Boeing Commercial Airplanes's population is 60,000.
Gas turbine engines have less moving parts,so they last longer.They run on kerosene which is cheaper.This is the simple answer.
Bathrooms
Yes, but not commercial airplanes.
Airplanes are not made of gas.
The most popular commercial airplane is the Boeing 737.
Hundreds of thousands! (approx.)
Countless.
Stratosphere
Because in most commercial airplanes, you would not be able to open any exit in order to jump out.
Yes, they can run out of gas.