I had a similar problem yesterday. I'm flying EWR-DCA on the 7PM Friday and coming back DCA-EWR on the 7:30PM Sunday. I got the email yesterday with EUA notification. Two oddities -- 1) The EUA notice says it is for my Sunday flight -- which Wednesday at 8 pm was outside my window -- clearly a glitch as the EUA is for my outbound flight apparently. 2) I looked at my reservation online and see the outbound flight is no longer there at all! I called and have been told I was EUA'd on the first flight and the flight is still there, great, but still odd that said flight has disappeared from the reservation that I can see online. I hope I will still be able to check in for it online.