What proof does Yining need to fly back to Henan?

Now Xinjiang needs a negative nucleic acid test certificate within 7 days to return to Henan. In order to cooperate with the epidemic prevention and control work, those from overseas or domestic high-risk areas must report to their villages (communities) and units at least 72 hours in advance. The contents of the report should be specific to the return time, traffic route, health service center (centralized isolation point) and other information, and you must obey the arrangements of the local epidemic prevention and control institutions, and you must not return to Henan without authorization.

Article 12 of the Law of People's Republic of China (PRC) on the Prevention and Control of Infectious Diseases All units and individuals in People's Republic of China (PRC) must accept the investigation, inspection, sample collection and isolation treatment of infectious diseases by disease prevention and control institutions and medical institutions, and provide relevant information truthfully. Disease prevention and control institutions and medical institutions shall not disclose relevant information and materials involving personal privacy. Where the administrative department of health and other relevant departments, disease prevention and control institutions and medical institutions illegally implement administrative management or prevention and control measures and infringe upon the legitimate rights and interests of units and individuals, the relevant units and individuals may apply for administrative reconsideration or bring a lawsuit according to law.