u/Holiday_Ad_17

I’m in the check-in window right now on IAD–AMS, and the offer to upgrade from Y+ to J is showing €1400. There are still 5 seats open in J and 5 in Y+, so the cabin isn’t scarce.
We all know these upgrade quotes are shaped by your personal data and history, so I’m not asking about that. My question is: has anyone tried deleting/decoupling their FB number from the booking during check-in to see if it wipes that memory and returns a different price?
Has anyone actually tested this? Did the number move, or does the personalization stay tied to the ticket regardless?

I usually book and check in only for the intercontinental flight itself, so I'm stuck waiting for the standard 30-hour (24-hour for US) check-in window to open before I can see any upgrade offers.
But people with a connecting flight before that same intercontinental segment can check in for their whole itinerary as soon as check-in opens for their first flight — which could be many hours (or even a day) earlier than my own check-in window opens.
Does that mean connecting passengers get to see (and grab) upgrade availability before someone like me who's only flying that one long-haul segment? Or is upgrade inventory released at a fixed time regardless of when you check in?