the plane needs to move forward to create lift under the wings. the tires just make a safe way for the contact between plane and ground. but with a conveyer belt moving in the opposite direction at the same speed, the plane is basically sitting in one spot and wasting fuel.

when u run on a tredmill, if ur running at the same speed as the tredmill, dont u sit in one spot? DEE DEE DEE
so now explain to me how the plain gets its lift...