I have a US metal and flight number itin for SEA-PHL this evening and by default, united.com can't find it since it looks via MP number (even though my MP number is in the reservation).

However, it does show up in My Itineraries is I list them.

As an aside, I can see usair.com is as useless as united.com is. I can't use UA web-checkin since it's not a UA codeshare, and USair.com 404's at the verification page.

So now I have to show up 30 mins earlier then I'd like to stand in line (hope US has a Star Gold line) and check-in in person (and probably get charged $10 for the privellege ). I just hope my Exit Row seating requests I was able to select on united.com transfered over. *crossed fingers*