I often fly from UK to USA via a US Hub.
If I check in at a US city for my flight home via a HUB - i.e IAD or ORD and get my boarding pass issued for my connecting flight, am I less likely to get an upgrade than if I had checked in at the hub city?
For example, if I flew LAX to LHR via ORD, and have my ORD - LHR boarding pass issued in LAX, are those folks that check in at ORD for the LHR more likely to be upgraded or doesn't it matter?
I've often wondered about this since if a flight, say ORD - LHR is oversold, but you check in at another city many hours before, they are likely to give you your original seat... I've found it unlikely to be upgraded at the city you started out at...
Any other experiences out there?