Quite a few years ago we flew Air China, to Beijing and vowed never to use them again. The whole plane was filled with smokers, even in the non smoking section, most of them chain smoking and that was horrible to a non smoker. The food was not good, and the air crew sat and shared out a large box of Toblerone between themselves instead of giving them to the passengers, and the crew didn't even strap themselves in when requested, just flipped the strap over their shoulders and got up and wandered around before the plane had even stopped. The in-flight entertainment was a propaganda film of Chairman Mao which lasted about 2 hours!