TSA spokeswoman Andrea McCauley, however, said the agency has managed to stay "one step ahead of those who wish to harm us" by taking a "layered" approach to security. Among the layers: reinforced cockpit doors on about 5,800 domestic aircraft, and 45,000 federal screeners who had, through May, intercepted 3.9 million knives and 1,905 guns at airport checkpoints.

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http://www.dallasnews.com/sharedcont...ety.7307a.html

I wasn't aware that the TSA reinforced the cockpit doors.