As disasters go, this one was terrible, but not unique, certainly not among the worst U.S. air crashes on record . There was the unusual element of the bridge, of course, and the fact that the plane clipped it at a moment of high traffic, one routine thus intersecting another and disrupting both. Then, too, there was the location of the event. Washington, the city of form and regulations, turned chaotic, deregulated, by a blast of real winter and a single slap of metal on metal. The jets from W
