Agreed, "A" Concourse is basically only NW, ATA, Midwest and Spirit (who am I missing?) and the line at security moves very quickly. 10 minutes, even on a weekday morning should be enough (especially as the crowd at that hour knows the drill).
USAIR over in "C" is the scary line.
Originally Posted by Alpha Golf
I've never waited more than 5 minutes at NW concourse at DCA, my home airport. So half an hour should be plenty. Walk to the gates is only about 3 minutes from there.
CO/DL/others can be much longer, specially Friday afternoons.