A jet IS an airplane. These days many, but not all passenger planes are jets. Many small ones are piston engined.
Airplane engines use jet fuel. Read more, below.
Jet propulsion improved airplane flights. Before that piston engines were used. They were much slower compared to the jet engine.
Well yes, assuming if an airplane does not have a jet engine, it would not be called a jet.
Gravity, force and lift are all forces that cause an airplane to fly. There are more forces depending on what time of airplane is in flight. For example the forces used to keep a comerical jet as to a fighter or military jet. As there are many forces the same the proportion is different there for the air flow if different on each airplane.
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Ordinary jet engines are used on aircrafts. But some planes require turbojet engines. These planes fly at more than the speed of sound. There are other type of airplane types too.
The 757 is a jet airplane. It does not have propellors.
For thrust. Engines are used to overcome the drag of the airplane.
It depends on what kind of jet or commercial airplane it is.
The first jet airplane was designed in Germany in the early 1940's.
Avgas is a common name for fuel used by internal combustion engines in aircraft, while jet fuel is used in jet engines.
Boeing made the first JET airplane with its Boeing 707, or Dash 80 as it was called before.