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Please see the official X‑Plane Support page for help.
In selecting the 747-100, click Customize on the aircraft Icon. You can check the box in X-Plane 11 to start off with the shuttle on top of the 747 ready for flight at any airport.
For X-plane 10 you need to make sure you select 'Aircraft and Situations' under Aircraft menu. Make sure that Orbiter.acf is setup as the 'aircraft used when you select the SHUTTLE options above'.
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