Answered by ZUPAN
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Jun. 25, 2019 15:30
There is no problem about it. It is important whether your itinerary is eligible. So, if your itinerary looks like this:
US - Beijing - Vietnam
and you don't have any additional landing within mainland China, this itinerary is eligible for 144 hours visa free transit in Beijing (144 hours has replaced 72 hours couple of years ago).
For your journey back, you should also take care that your itinerary looks like:
Vietnam - Beijing - US
Here you will also take care that you don't have any additional landings within mainland China. You will count how many hours are there between your scheduled landing in Beijing and your scheduled departure from Beijing and if the number is shorter than 24, you will travel covered by 24 hours visa free transit. If the number is longer that 24 hours, you will again enjoy 144 hours visa free transit.
This is it and, please, just use correct terminology because this is not 72 or 144 or 24 hour visa, but 144 and/or 24 hours visa free transit, so there is no visa at all!