SAS is commonly maintains attitude while in atmosphere lest the spaceplane tilt if its center of mass is not at its center of lift.
Winglets, control surfaces, or reaction wheels enable atmospheric maneuvering, with RCS sometimes used in extreme situations. Raising the periapsis out of the atmosphere requires non-airbreathing engines. Such airbreathing engines are rarely capable of raising apoapsis out of Kerbin's atmosphere, and can never raise periapsis above their maximum operational height. A plane with only jet engines cannot reach a stable orbit because its engines will shut down before leaving the atmosphere. Reaction engines sometimes replace jet engines to simplify construction without restricting the craft to oxygenated atmosphere, but reducing the efficiency even more.
In space or oxygen-free atmospheres, less efficient reaction engines must be used. Jet engines can efficiently propel craft in Kerbin and Laythe's atmospheres. 3 are like the Space Shuttle to varying degrees the Dynawing, the Learstar A1 and the Slim Shuttle. The latter especially shows how simple a small spaceplane can be with the CR-7 R.A.P.I.E.R. Various pre-built stock spaceplanes are available, 2 of which are SSTO spaceplanes the Aeris 4A and the Dove.
Spaceplanes are usually built in the Spaceplane Hangar and launched from the Runway, and some are launched from the Launch pad - often with a rocket reaching space.
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