Answered by ZUPAN
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Nov. 03, 2019 23:30
Trust me, this with China is an easier part than that with Canada.
You will print out your flight ticket and have those printouts with you as proof of your transit. Also, you will declare at check-in in both Ciudad de México and in Vancouver that you will travel to Thailand via Guangzhou, China, using 24 hour visa free transit. This is all of the formalities and documents that you will have to do along with your valid passport.
Upon arrival in Guangzhou you will just perform, but very quickly, all the formalities and wait for your flight for Thailand at the gate. There is no much you have to do in Guangzhou, but you will cross the security, some form of simplified immigration where they are checking the validity of documents and visas for your next destination. You already have Thailand visa, but this is not necessary since Mexican citizens receive 15 day Thai visa on arrival. Basically, this is all you will do in Guangzhou.
Also, on your return, you will declare similar at check-in in Vietnam where you will declare that you will travel to Ciudad de México via Guangzhou, China, using 24 hour visa free transit. Again, you will present your flight tickets and after that you will be allowed to board the plane. Upon arrival in Guangzhou, you will cross the same procedure as for your first flight and you will be allowed to board the plane for Vancouver/Ciudad de México. As you can see, there is nothing too much complicated :)