Originally Posted by MSPeconomist

However, you can check in for DL flights and drop checked bags at the Airport Express Station. It worked the last time I was in HKG but you should check that this is current. You can check in and check a bag early there (when you purchase a ticket to the airport) but I don't know how early you can check a bag for DL. The service is oriented more toward people who check in during the morning and then go to the airport for evening flights.

Are you not planning to get a hotel room for the night?