Widely regarded as the first modern airliner, the Boeing 247 flew in February 1933 and was the centerpiece of Boeing's display at the 1933 World's Fair in Chicago. It was the first design to combine all-metal construction, a low-mounted cantilever wing, fully retracting landing gear and an autopilot. The largest order was from Boeing's own Boeing Air Transport and the second for the Boeing-Pratt &amp; Whitney partnership, United Aircraft and Transport Corporation. DZ203 was part of this batch, construction number 1726, and went into service with United as NC13344. After the 1934 Air Mail scandal, these companies were broken up and those aircraft became part of the newly forming United Air Lines.