C3O1N1V4E1R1T1A1P3L1A1N1E1
20 points
CONVERTAPLANE is validvalid
an aircraft that can land and take off vertically by temporarily directing its propulsive thrust downwards, also CONVERTIPLANE, CONVERTOPLANE
an aircraft that can land and take off vertically by temporarily directing its propulsive thrust downwards, also CONVERTIPLANE, CONVERTOPLANE