Is it possible to make a new transport like jet plane? I would like to try make something like arсade flight simulator in Fortnite. Or can I somehow at least change the behavior of common plane from Fortnite and change model?
You have not added the Fortnite tag, so now it seems like you are asking questions about only Unreal Engine. So, if you are using the traditional Unreal Engine version, you can very much make jet planes and basically whatever you want.