Originally Posted by
emcampbe
I assume you are referring to a change before day of travel, correct? If so, if you booked through UA (016 stock) then of course ANA won't change it. They don't have control of the ticket. Technically, they might be able to take control but probably didn't want it to mess things up. If people want to find ways to book through UA on 016 tickets, that's perfectly fine, just don't expect anyone other than UA to make changes.
+1
I changed through UA. It was 36 hours prior to scheduled travel, and I moved flight up a day to within 12 hours.
I would only try to change through operating carrier at the airport.