That can happen when you're trying to fly aircraft which are AI-only. Did you read the read-me?
The usual convention with AI-only aircraft is to prefix the name which will appear in the menu with ~ or AI_, depending on who made them. These are NOT to be player-flown, and are usually accompanied in the install package by a version with a normal-style name which you should select to fly yourself.
Of course, there are other possibilities, but this is often what has happened.
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