Originally Posted by
amartin1979
What is the earliest you can check a bag for a flight? 4 hours before, 6 hours before, etc?
Technically, the new rule as of this summer is that you can check in and get a boarding pass up to 24 hours in advance, and you are allowed to check a bag beginning at midnight day of departure. This contrasts to the existing policy, which only allowed this if there was an IROP indicator on the PNR.
Alas, most ticket counters aren't open 24 hours.