My September travel plans changed for flights from SFO-IAD and return. Created illegal international connection at IAD. Although my 757 downgauged to an A319, my upgrade was retained. When I changed to the earlier flight to get a legal connection (the one I had was 20 minutes!), the new 757 I was booked on didn't have confirmable NF space (it used to be a 767) so now I'm waitlisted for that segment.

Check your itineraries!