Originally Posted by
rkkwan
Let me just state this. The millions of HKers who have a HRP who go to China absolutely DO NOT take anything other than a HRP to enter China whether they're taking a bus through Shenzhen Bay, or taking any non-stop flight from HKG to China, or train, or ferry, or whatever.
[And of course, they use a HKID to leave and re-enter HK.]
I think what christep has meant is the need to show proper travel document to the country of destination before the airline will allow one to board.
If flying from CAN to LAX, the traveller must have a proper travel document for U.S.A. If flying PVG to HKG, then the permanent HKID card will suffice.