Permanent HK ID Required to Apply to CX
Um... Unless you have a permanent HK ID, you can't apply to the CX Cadet Programme.
Cadet programmes offered by Airlines are quite rare, I only know of two other airlines that do cadet programmes. There's Dragonair, which is owned by CX. The application for Dragonair asks you for an HK ID number but in the FAQ it says that "Overseas applicants..."
I'm not sure but I think there's a Cadet Programme offered by Emirates.