I know CX has a priority list guiding them who to give OP-ups to. But does when a person check-in, early or late, affect their chances of op-ups? Are lower boarding numbers assigned to those who have checked-in earlier?

What about Counter Check-in versus Online Check-in?

Can't seem to find any threads answering these two questions. But I am sure the very knowledgeable people on this forum could.

Thank you in advance