ORD-LGA this week and I'm #2 for 1 available seat.......I know from history 1-2 extra seats can usually free up due to misconnects and people moving up to earlier flights or later ones.

I ask GA how it's looking for me and she says not a chance but we'll come get you if something opens up.

Sure enough she comes on-board with my FC BP and even two others, saving me from 12C (MCE only had middles when I did confirmed flight change).