Unity standard assets 2018.4 Aircraft Ai isn't working on my own 3d airplane model.

I made a airplane model out out simple unity shapes (cube, cylinder, etc..) and i attached both standard asset scripts "Aeroplane Controller" and "Aeroplane AI Control". I gave the AI script a target and it flies toward it, but it's like the x,y,z axis are wrong and the plane flies all wonky and sideways.

I've tried over and over to reconfigure the x,y,z axis on my 3d plane model to make it fly properly but it's never right and always flies wonky sideways every time. The directions that come with the scripts are very vague and make it seem like all you have to do is attach the two scripts to your model and you're good to go but that's a got damn lie.

I attached the two scripts to the airplane prefab that comes with the standard asset package and it works fine. But I want to know how I can get it to do the same on my own airplane prefab? Has anyone run into the same problem with this? Is there a simple fix I'm overlooking? Any help at all is very much appreciated!