 The gliders which were most widely used by the Allies were the American-designed Waco CG-4A, which could carry 13 passengers, and the British-designed Airspeed Horsa, which could carry 25 passengers.Both of these aircraft used plywood extensively in their construction, with the CG-4A also using aluminium to provide greater strength in its framing.To deliver especially heavy loads, the British General Aircraft Hamilcar could carry up to eight tons (8,000 kg) of equipment.