Also....think of it this way.....

Can I run forward on a treadmill and throw a balsa wood airplane forward? Will it fly. It will.....and the laws of lift apply the same to the plane on this conveyor belt.....But instead of my legs running on the treadmill, the wheels roll on the conveyor....and instead of my hand providing the propulsion for lift, the turbines move the air (independent of the conveyor remember, they are seperate forces) to provide the propulsion for lift.