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This is a low-tech, simple micro-shuttle for use in early Career games. It is placed on top of a rocket and launched into space as an unencapsulated spaceplane.
.Craft file for Kerbal Space Program 1.0.4 can be downloaded from KerbalX (Link: http://kerbalx.com/pandoraskitten/X-1-Micro-Shuttle).
Here’s a short video on how such a craft can be used in KSP: https://youtu.be/PQxTkrpkPMA