<begin sardonic observation>
The FAA is keeping DCA closed because it believes that it can't make DCA as safe and as well-protected from terrorists as, oh, let's say, Logan Airport in Boston.
<end sardonic observation>
ebell, you're quite right. If the government believed that security measures would make an airport -- any airport -- safe, then it would impose those measures at Reagan National, and the airport would reopen.
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"Yes, but at least mine will be found in a first class seat." -- Peattie and Taylor