In Transit in Beijing - Air China 880 AR at 17:10. Dep with Air China 979 at 19:35.

Canadian traveller from Montreal, CA arriving in PEK at 17:10 (T/3) and departure from PEK (also T3) to Bangkok, Thailand at 19:35. A layover of 2h25 should be sufficient time. Does point #3 above apply in this case? In other words - stay in transit area without going through border formalities...etc? What is the most convenient way for Canadian traveller just passing through and taking a connecting flight with same airline?

Thanks for your assistance.