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Please see the official X‑Plane Support page for help.
1. Yes, planemaker is included in the basic version of Xplane 11
2. The Airfoil modeling is good. However, you can get something like Blender to improve the quality of your flight model. Also, you can model the cockpit of your aircraft quite nicely. It also happens to be the program that all the payware aircraft developers use.
3. Take a look here
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