I have a partially used ticket with fare basis PNA86SNC. I flew the outbound (US to Europe), but had to cancel the return (Europe to US). I would like to rebook this ticket and use the residual value (~$800) at some point, as I often fly this route.

I thought it was the case that if there was a flight leg with availability in the P bucket, I could rebook with that leg and not have to pay a fare difference. When I just called into the Premier Desk, I was told that that’s not always the case, and that in fact to rebook this ticket with a particular date that has a flight available in the P bucket, I would have to pay a fare difference of ~$3,000.

I (unfortunately) don’t have the full fare rules and the United website does not seem to have them available. The agent did not seem to know much more about what conditions triggers re-pricing. Does anyone here have any hunches for how to find a use for this residual credit? Ideally, I’d be able to use the remainder of the ticket at the original fare, because that was a great deal, but as I don’t have the fare rules, I’m not sure what conditions I’d be able to do that under.