Orbital Carrier
A concept I am playing around with for my military cassette futurism setting. Planetary operations are conducted from carriers that enter the atmosphere just enough to allow aircraft to launch from it. In this world, there is dedicated space craft and dedicated aircraft.
What kind of propulsion would a carrier need to maintain its orbit? Would it need constant thrust to keep it airborne? Should I use jet propulsion or big ass helicopter blades? Is there a point in the atmosphere that gravity isn’t that big of an issue?