Here's how it works:

* Engines: Airplanes use engines (either jet or propeller) to create thrust.

* Jet Engines: Jet engines suck in air, compress it, burn fuel to heat it, and then expel the hot, expanding air out the back. This expulsion of hot air creates thrust.

* Propeller Engines: Propeller engines use a rotating propeller to push air backward, which in turn propels the airplane forward.

Think of it like this:

If you blow air out of a balloon, the balloon will move in the opposite direction of the air you blew out. An airplane's engine does the same thing, only on a much larger scale.