>First, does all HK low floor buses, which includes, Tridents, Super Olympians, MAN 24.3210, Neoplan Centroliner and others have ramps for the wheelchair-bound passengers?
all Super olympian and centoliner have ramps
some of the trident of Citybus of HOng Kong don`t have ramps
>Second, do the luxury seats only available on Airport Buses?
I think so , but some of airport bus route will use
if you are lucky, you may travel in a luxury bus in non-airport route