Tailplane is a coordinate term of foreplane.

As nouns the difference between foreplane and tailplane

is that foreplane is a relatively flat surface located well forward of a vehicle's center of gravity used for stability and, when movable, used for steering and attitude control; common on submarines, also used on surface ships and aircraft while tailplane is a horizontal airfoil, at the rear of an aircraft, to which the elevator is attached; usually associated with the tailfin.