Originally Posted by martinplas
...4) when relying on a EUA that has not come through I make sure to check in on line at the minute the 24 Hour before flight check-in becomes available so I am on the top of the waiting list...
As I understand it check-in time is only a tiebreaker amongst a fare class. An H will trump an L no matter that the H checked in an hour ago and the L at 23:59 prior.
So theoretically important but I bet, at least on the lower fare classes, mostly meaningless.