Quick question. I'm flying to LA for new years and used 50,000 UA miles to get an economy ticket (yes, I booked it two weeks ago and I was desperate.) My fare code is Y and I'll be flying P.S. (flight 25.) I'm looking at the seat maps for thursday and economy is completely full as well as business but there are 6 open seats in first. Is it possible they would upgrade high ranking elites to first, which would open more seats in business, allowing people to pay for upgrades at check-in? If so, how much would it cost? It's a long flight out there this time of year and I'd be will to spend $200-300 for an upgrade.
Thanks for your help!