Answered by Chester
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Dec. 08, 2014 19:47
If you fly from HK to Xian and then back to HK, this trip is unable to enjoy the 72-hour free transit.
If you fly from HK to Xian and then back to Macau, you may be possible to enjoy the 72-hour free transit. But the risk still exists. The officer at the immigration may consider your trip is a round trip since HK and Macau are very close to each other.
Or personally speaking, you may consider to fly Seoul - Xian - HK and then go back to Canada. In this way, you can easily enjoy the 72-hour free transit and do not take any risk.