Douglas DC-2 (1934-1937): Even before TWA took delivery of the DC-1 prototype, it ordered 25 more Douglas transports under the designation DC-2. The new plane was similar to the DC-1 but had increased engine power and was more than two feet longer, which meant it could carry two more passengers. The DC-2 made its first flight on May 11, 1934. That same year KLM entered a DC-2 in the London-to-Melbourne Air Race. It made every scheduled passenger stop on the 9,000 mile route, carried mail, and even turned back once to pick up a stranded passenger. Yet the DC-2 finished in second place behind a racing plane built especially for that competition. (A modified Boeing Model 247 came in third.) The DC-2 became the first Douglas aircraft to win the famed Collier Trophy for outstanding achievements in flight. Douglas eventually produced 156 DC-2s at its Santa Monica, Ca. plant.