dont count on the loads being up as the reason! abe to clt was an a-319 then for about 8 or so months was an erj that was oversold 95% of the time and now back to the 319. They are probably getting the mainline in just for the election season then revert back to the junker 145 crap. that would be my guess
I believe that the DCA-ALB and DCA-BUF service on mainline is a Friday night only flight. This helps position airplanes to ALB and BUF for the non-stop Satruday flights to MCO out of both stations.