Connection from domestic to international at Beijing Capital Airport

Looking to book fly tickets but have questions. If we arrive from Zhangjiajie to BJ (domestic) at 00.25 (in the night) with Air China, is it possible to catch an international flight with Air China at 02.30 or even 02.00? We will be flying first class Zhangjiajie-BJ so we will be one of the first to leave the plane and we will be flying business on the international flight so we will be able to go in the “fast track”. And we will book the whole flight (Zhangjiajie to Sweden) on one ticket so our luggage should hopefully be sent directly to the next aircraft in BJ .

1,5-2 hours is usually plenty of time for a transit but since I have read that China is so “different” I’m looking for some advice from someone with experience. What can we expect when we arrive in BJ , from when we exit the domestic flight, until we enter the international flight?

I guess that Air China wouldn’t sell tickets with a too short connection, but still?

And does anyone know if the Air China flights from Zhangjiajie to BJ usually arrives on time or with delay?