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It costs $45, which is a lot but in my opinion it is worth it. You can also try the demo version on their website.
Unity Asset Store :
www . assetstore . unity3d . com/#/content/9409
Their Website :
gargore . com/uas/aircraft-toolkit/
Try The Demo :
gargore . com/uas/aircraft-toolkit/demo.0.78.2.php
You will have to remove the spaces between the letters as I am not allowed to post links or emails until I have this account for a week.