If I arrive at Beijing Terminal 3 (on the Air China flight from Datong) at 10.30, will it be possible for me to catch the 12.10 (Terminal 3 also) Air China flight to Guilin ...... or is 1 hour and 40 minutes too little time to make this connection? How big is the allowance (size dimensions, plus weight) for hand luggage on domestic flights with Air China? Maybe if I only have hand luggage I will be faster and will be able to catch the Guilin flight? Please advise me! Thank You!