I was wondering when they'd revert. I flew DCA-CLT-DFW-PIT-DCA shortly after Presidents' Day, and on the 3 segments where I was upgraded we got plastic cups.

Off the subject, here's a tip for DCA flyers: if you haven't used web check-in, don't forget the kiosks by the shuttle desk (near security entry to gates 35-45). I arrived at 5:40am for a 6:20 flight and discovered a horrendous line (folks trying to get out after DCA was closed on account of a major snowstorm the prior weekend). Worse, all the nearby kiosks were out of order. The downstairs kiosks saved my bacon.