If you are running a successful space agency, you will be flying to Kerbin-Orbit a lot. The Kerbal Space Transport System (or KSTS) will allow you to record launches of your transport rockets and planes to be used in automated missions later. It will allow you to transfer resources, crew-members and even deploy brand new ships directly into orbit. And because the cost of launching your payload is only as high as the cost of the mission you've previously recorded, you will benefit greatly of building reusable space planes without the hassle of landing them by hand every time.
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