I have 2 simpleplanes and both have different aircraft saves, one is original, one is a clone that have all the "potato" vehicles, I used dualspace to clone it. When flying a plane, no matter how small the part is, when that part gets destroyed, the plane immediately loses control or aerodynamic but still has thrusts from engines. A glass fuselage also triggers this. Also, the wings I use are Wing-2 or a regular wing edited into a structural wing. I thought I've been experiencing it for a year but I'm fine with that