Originally Posted by
eponymous_coward
Going HKG-CTU-HKG means you're going BACK to your country of origin (HKG doesn't count as "China" for this, it's your country of origin). Your friend is going to get static at CTU like
this blogger did, for the exact same reason. You need to be transiting from HKG through China to somewhere that isn't HKG.
They will receive NO static in CTU, as there is very little if ANY chance that CX will allow you to board in HKG without showing proper documentation for the TWOV (a flight going to a third "zone" within 72 hours). There are very severe penalties for any airline that does not follow these rules.