Hallo,
die Abgabestellen befinden sich in HKG Island und Kowloon und Cathay ist auch dabei:
Simply check-in and collect your boarding pass as early as one day in advance or as late as 90 minutes before take-off. (If you use an Octopus Card to travel via the Airport Express, your full fare will be deducted at check-in rather than when you board the train).
You may check-in up to one day prior to departure when flying with the following airlines:
Aeroflot
Cathay Pacific Airways
China Airlines
Dragonair
Mandarin Airlines
Qantas Airways
Singapore Airlines
South African Airways
Swiss International Airlines
Thai Airways International PCL
Vietnam Airlines
Service hours: 5:30am -00:30am daily (Exact close-out times will vary according to individual airlines' flight schedules.)
For full details, please contact your airline directly.
Und klick 
Dauert zuwar lange bis die Seite lädt aber da findest Du alle weiteren Info´s.
LG
Sandra