Originally Posted by
droopyUA
As long as you book through United, so a ticket on UA stock, it doesn't matter if it is codeshare or not.
This has been my experience on AA; I think on UA it would be the same.
Similar situation would apply if you had a mixed carrier itinerary (i.e. UA and DL flights) issued on a 016 ticket. The new ticket doesn't need to contain DL flights and you only have to pay one UA change fee.