Modern Marvels: Fasten your seatbelts as we take off on a flight through the history of commercial aviation--from the first jet passenger plane, the de Havilland Comet, to today's wide-body jets and supersonic Concorde. It's a story of high-tech worldwide competition among a field of high-stakes players. Billion-dollar deals ride on cutting-edge designs. Pilots train for hours in ground-based simulators, while computers fly the planes. We also catch a glimpse of the double-decker flying hotels of the future.