Today in 1910, air-to-ground radio transmission is born; 1913, the first loop-the-loop maneuver is performed; in 1939, the jet age begins with the first flight of the Heinkel 178; 2006, Comair 5191 crashes in Lexington, Kentucky.
As part of a farewell tour ahead of United retiring the 747, the jumbo jet is visiting each of the airline's hubs, including Newark-Liberty International