I didn't receive an EUA on my saturday cle-iah plane until after I was in the air on the first leg of my trip. I didn't find out about my upgrade until I boarded & found someone in my 9A seat. the crew were very nice about letting me hang out in first until they found out who had 9A (the other person) & told me I had seat 4A.
when I got home that night, I re-checked my email, & there was the EUA. It hadn't been there the day before, nor was I upgraded when I checked in at sea.
DG