It's been a long time since I've had airline status - but I'm about to achieve OneWorld Ruby this year via Alaska (Atmos Silver).
https://www.alaskaair.com/atmosrewar...ntary-upgrades
https://www.alaskaair.com/atmosrewar...RoMzY4MjAwNTY0
So I see AA Main Cabin Extra upgrades start at 24 hours prior and FIrst Class upgrades are theoretically possible
My question then is for SFO/LAX/SEA --> DFW or MIA, then DFW/MIA -> SJO (costa rica)
How probable are such upgrades if not traveling during peak seasons (No holidays on either end for example)
Is there any such tool that I could use to guesstimate this in advance? Expertflyer?
And from my reading, these complimentary upgrades do NOT extend past Central America?