check-in 20 hours before flight at HKG?
I'm flying into HKG at around 4 PM and flying out the next day around 12 PM on Malaysian Airlines. I'd like to save some $$ by not using the hotel but using airport lounges as much as possible. I have AMEX Plat + Oneworld Emerald (American Airlines).
After I arrive at HKG, I'd like to have a quick night seeing in Hongkong and then I'm hoping to be back at the airport around 11 PM to go into the airside to use plaza premium for a nap/rest to save some hotel costs. All I have will be carry-ons. Will Malaysia Airlines allow me to check in the night before the flight? Can I go to the airside with that?