You can simply use Pin behavior to attach all parts to the main plane sprite.
But, if you are using Physics, pin will not work correctly. You can try joints, or enable Physics only for the main plane sprite, and not for its parts. This way you will still be able to pin them to the plane.
Container is used to "logically" connect a group of objects. The plane and all its parts can be in the same container, but you'll still need to pin them together.