Answered by Arvin
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Aug. 20, 2014 20:36
HK is not included in the China mainland 72-hour free transit.
Do you make a transfering in HK? Based on the policy, USA nationals can enjoy a 90-day free entry. So you can only use your passport to enter HK. If you only transfer at HKIA, you will get a slip for transfering with your passport.