According to CCTV news, according to Bloomberg on January 23 local time, Mike Whittaker, the Director of the Federal Aviation Administration of the United States, said that if evidence of other issues with Boeing aircraft is found, the Federal Aviation Administration may expand its investigation scope on Boeing 737 MAX 9 aircraft. However, at present, the investigation still focuses on the failure of emergency safety door components of 737 MAX 9 passenger aircraft, as well as related inspection and operation safety.