at DCA the big crowd i have seen is in the am at term C. i have been told they are going to MIA to get to central and south america.
last week, my wife flew DCA-BDL and ret. the flight was posted to be in terminal C. following my advice, she cleared at B, and the SHUTTLED to C. after waiting until about 20 min before the flight, she realized no airplane. the flight had been moved to terminal B. she SHUTTLED back from C to B, and caught her plane. the shuttle is on the tarmac, and requires down and up a set of temp iron stairs. not a problem for most, but my wife is over 65, and no assistance is offered with luggage.