Originally Posted by
Absolute
It also depends on the airport, as I don't see any listed - some international airports with limited flights will only open their UA check-in at 3 hours before departure, not 4, while others like SIN have a dedicated "if the checkin desks are closed" rooms that you can check-in at hours before they open.
Sorry, what are you referring to here? I am unaware of anywhere at SIN to check in for a UA flight if the UA check in desk is not open. (Sounds a bit tautological!)