Any restrictions on entry? Ie vaccination status, quarantine, testing regime?
If you're in Group A, you do not get in, unless you're an HK resident. Even then, you have to spend 21 days quarantine (way too long I agree). Group A are countries where Covid is rampant so it includes Europe/USA etc.
Flight crews have to isolate for 3 days and get tested regularly.
If you're not vaccinated, regardless if you're an HK resident or not, you do not get in.