I'm a bit new to this, so maybe this is normal ... but ...

Yesterday I booked a trip between BOS and SFO. I booked on United.com and decided that given the length of the flight, I'd guarantee myself F seat by simply booking it and paying for it. After selecting my seats and confirming the reservation, I looked at the online itinerary to make sure everything was OK ... it was. The fare was listed as a YUAUP and next to cabin it read "United First".

Well, based on everyone's advice around here to keep checking your reservations, I decided to go take another look this evening at the itinerary. Lo and behold, the cabin is now listed as "United Economy", even though the seat assignments are still the correct F seats that I reserved. I called UA and spoke to a rep who confirmed I was in first, but said that the reason I was seeing "United Economy" is because I also happen to have Economy Plus Access (even though that's not being used for these flights.) Not sounding quite right, I called back again and spoke to another rep who gave me a similar answer.

So, is that explanation correct? I may be mistaken, but in the past, the times I've booked an F seat on either a YUP or QUP fare, the itinerary has always listed the cabin as being United First. What's also disconcerting is that last night (when I booked), it *did* say "United First", but somehow has mysteriously changed.

Do I have any reason to be concerned? Flight isn't until later in June.