Originally Posted by
canadiancow
You can only upgrade codeshares at check-in, so I'd try not to book one if that's your intent. It's also harder to tell what the fare will map to if it's a codeshare.
Its UA K class. EWR-YYZ-MXP return for $420 USD. With the YYZ-MXP on AC. Cannot replicate that with AC fare :-). Hopefully at least preferred seats with SE status. Have to pull the trigger on this soon.