Early morning in Hong Kong Airport
There are Terminal 1 & 2 in Hong Kong Airport. If you are riding airlines which their counters are in T2, you may need to notice this.
The Automated Peoplen Mover In T2 are closed between 1am and 6:30am. If you check in before 6:30am, then you need to proceed to T1 for immigration and security clearance.
Also the duty free inside restricted area opens at 6:30am.