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Thanks a lot for your feedback. I do know about terminal velocity. However, I didn't intend this to be realistic (more arcadey, as I thought the graphics would show), quite simply because airplanes aren't ment to drive through those kind of parcours. Talking about friction etc. Thrust reversal isn't enough in that case. Turning sideways is intended as well, because the rotation axis changes when you fly down or up.
However, if you (everybody who reads this) want those two things to be changed, please vote their two comments up or comment yourself. If you aggree, I'll be changing it as soon as I get access to my computer again, which will most likely be tomorrow.
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I haven't seen a full-featured unity game around there, but I find its capabilities very high.
This is not the game yet, I'm sure you know that. Go google for "terminal velocity". Good luck with your projects.