So I booked my first A321T transcon in about two weeks. I can't find a place on the website to upgrade with miles (although not likely available). Is there a way to do it without calling? Is there a way to see availability on line other than the seat map? Thanks!
I'm no expert, but when I did a miles+co-pay upgrade on a recent international flight, I had to call. There was no telephone charge.
Upgrade space is searchable at Expertflyer, you cannot confirm an upgrade with miles online you will have to call.