I have 2 UC passes that will expire in early Dec. I got these passes through me UA MPE card last year (12/'17).

These passes will expire and I'll get issued 2 new ones. But I plan on cancelled the card shortly (doubt I will get a good retention offer).

Is there anything I can do maximize my UC passes? (other than sell it on eBat).

for ex: can I call in to ask for them to extend the passes for a couple months?
(my understanding is that the UC passes wont work if I dont have an MPE card?)