Originally Posted by smg77

I am experiencing a similar issue. Booked a trip via CO.com with CLE-DEN-SJC on UA metal and returning SFO-CLE on CO metal.

The return CO segment is a M fare, instantly upgraded to F (ZE class). No problem.

The outbound on UA is weird. According to CO.com it is a L fare. When I go to united.com to select seats, the Cabin is "First (NF)", seats "N/A" and "Upgrade: Pending" on both UA flights. When I attempt to select seats, I am shown the F seat maps, but the seat assignments don't stick and I get an error message "There was an error updating your PNR."

Any suggestions on how to fix this? Call CO or UA?