itween path , orient to path...plane rotation

I have a jet plane, which is a 3d model with a bumpber camera attached..I want the plane to follow an itween path, but when it rotates to the y axis, i want to have a rotation on y axis as well, to simulate a plane tilting..I know it has to do something with quaternion to euler angles, but i don`t know how to implement it exactly...

can anyone help me?