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In aircraft, a V-tail (sometimes called a "butterfly tail") is an unconventional arrangement of the tail control surfaces that replaces the traditional fin and horizontal surfaces with two surfaces set in a V-shaped configuration when viewed from the front or rear of the aircraft. The rear of each surface is hinged, and these movable sections combine the tasks of the elevators and rudder. The V-tail has not been a popular choice for aircraft manufacturers.

With fewer surfaces than a conventional tail, the V-tail is lighter and produces less drag. The air flowing over the tail surfaces is also likely to be less turbulent. A V-tail tends to reflect radar at an angle that reduces the return signal, making the aircraft harder to detect. This is an advantage for military aircraft.

Combining the pitch and yaw controls is difficult and requires a more complex control system. The V-tail arrangement also places greater stress on the rear fuselage when pitching and yawing.

In aircraft a T-tail is an arrangement of the tail control surfaces with the horizontal surfaces (tailplane and elevators) mounted to the top of the fin, rather than the more common location on the fuselage at the base of the fin. The resulting arrangement looks like a T when viewed from the front or back.

There are pros and cons to this arrangement.

The tailplane surfaces are kept well out of the airflow behind the wing, giving smoother flow, more predictable design characteristics.

The effective distance between wing and tailplane can be increased without a significant increase in the weight of the aircraft.

The tail surfaces are mounted well out of the way of the rear fuselage, permitting this site to be used for the aircraft's engines. This is why the T-tail arrangement is also commonly found on airliners with rear-mounted engines.

The fin must be made considerably stronger and stiffer to support the forces generated by the tailplane. Unless expensive composite materials are used, this inevitably makes it heavier as well.

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