Originally Posted by
FirstInFlight
It depends on the airline, but on some carriers if they have to resort to IDB the time checked in can be the deciding factor.
But otherwise, I often check in within 2 hours of departure.
I guess this is the main benefit consumer wise, other than selecting a seat if you were previously unable to do so. Above all else I'm guessing its mostly a money saving thing for the airline, since if you check in online you'll most likely get your boarding pass at the same time and they don't have to print it for you.