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After reading that the suicidal co-pilot of 4U9525 already "trained" on the way to Barcelona and reading into suicide by pilot again, divided into pilot- and hijacker-induced incidents, I came to think of United Airlines Flight 93 once again. And considering that there may indeed have been a fifth attack envisioned for 9/11, both White House AND Capitol could have been damaged or destroyed or whatever.
Of course, one may think that a rebuilding of both houses could be taken for granted. But what if not? And even if the President and Congress only do a provisory relocation, where would they go?