Jets Wall Calendar: The twentieth century witnessed an onslaught of technological advancements like never before. Among these many modern marvels, certain innovations are easily taken for granted. Take, for instance, the jet engine, which along with brilliant aeronautical engineering redefined the rules of warfare, and made the incredible speed and convenience of commercial air travel possible. If you admire these magnificent, sleek machines, you are sure to appreciate this spectacular wall calendar. EAN: 9781465010957