In 1933 Boeing introduced the world's first modern passenger transport, the Model 247. This all-metal, twin-engine monoplane with retractable landing gear sported a streamlined design. It carried 10 passengers comfortably and safely, and cut the coast-to-coast flying time from about 28 hours to 20 hours. Because Boeing had built the 247 for United Airlines, part of its United Aircraft and Transport Corporation, Boeing wouldn't sell the plane to United's competitors until United had received all it wanted. This restriction created the opportunity for Douglas Aircraft to enter the passenger airplane business in a big way with the DC-2 and the DC-3.