go to shenzhen airlines and you will have a lot of problems that you can not imagine. Try get the release letter, try change job even in another country, You will see what happens.Ask the guys that left to Dubai about the CAAC papers. Also you can enjoy there make a check ride with 4 check men in sim, and a friendly company police and the best FOs of world.If you have no job , so is a option but if have choice try another company in China.