In article , AJC
wrote:

Sigh. What immigration line? The passenger will be in international
transit arriving from somewhere (Toronto?) and departing to Singapore,
he never enters Hong Kong. Furthermore Hong Kong only has one
terminal, so he can't take a shuttle to and from his terminal. There
is a shuttle running the length of the main spine of the terminal
which he may or may not use in one or other direction depending on
which gates he has to transfer between. 55 minutes is enough to
transfer between two CX flights at HKG.

Further, CX hardly uses any gates at the top end of the Y.