Can China Southern Airlines participate in Air China's medical examination if it fails to pass the medical examination?

You can't. The physical examination requirements of China Southern Airlines and Air China are slightly different, but they are all implemented in accordance with the Civil Aviation Administration of China's Physical Examination Guide for Civil General Aviation Pilots. If China Southern Airlines fails the physical examination and wants to take part in the physical examination of Air China, the result will be the same. Under the guidance of professionals, we can make corresponding treatment and adjustment plans to improve the possibility of passing the physical examination.