Sky Bandits

Two old west cowboys, Barney and Luke, are drafted into World War I and enlist in the Royal Flying Corps, using their gunslinging skills to shoot down a German bomber before impersonating British officers and piloting an experimental airship called a "Gunbus". They join a squadron of RAF pilots flying makeshift planes in a battle against the airship, using six-shooters and dynamite to force its surrender. After escaping capture, Barney and Luke attempt to destroy the airship but are forced to abandon their plans when it's destroyed by their own squadron. In the end, they return to their old lives in the Wild West, but not before leaving behind a surprise: flying over their pursuers in a Gunbus.