Today marks the third time I've flown out of Washington National in the past week, and each time the security lines have been much longer than they were in the past.

Last Friday around 4 p.m.; Wednesday at 9 a.m.; and today (Friday) at 3:30 p.m. it took around 25 minutes from the time I first lined up in the security queue to clear the checkpoint on the center pier in the main terminal (AA/UA gates).

All four lanes were open on each occasion.

Does anyone know what's causing the longer lines? It never used to take more than 10 minutes for me to get through security at DCA. These are Dulles-length lines that add quite a bit of aggravation to the normally convenient process of flying from National.