This is a very good idea. In rocketry, air is your enemy. At the speeds rockets move it causes enormous heat/mechanical stress on the rocket, drag energy losses

This is a very good idea. In rocketry, air is your enemy. At the speeds rockets move it causes enormous heat/mechanical stress on the rocket, drag energy losses, and it messes with the flow of matter out the back of the engine that provides your thrust. With a jet engine, air is your friend, because it is the matter you spit out the back of the engine. And at the much smaller speeds of an airplane, mechanical and thermal stresses are much smaller.