Show martin designs plane to lower airline fares farea BALTI MD the glenn L martin aircraft company for years almost exclusively a producer of larger type war planes announced plans for or mass production of a SO 30 passenger twin engine commercial 5 ship hip which promises passenger fres ares lower than first class rall rail rates A full scalo scale mockup mock up of the plans plane was inspected by newsmen who were told the mass production would begin immediately after the initial demonstration flight of the first completed plane required by the civil aeronautics administration the plane designed for operations on main domestic trunk lines Is a low wing monoplane with a crul cruising sing speed of nearly miles an hour it Is expected to be especially good for ranges of to miles where larger four engine transports cannot be operated economically |