According to the World Health Organization, research shows that the risk of spreading infectious diseases on an airplane is no greater than any other mode of transportation.

When traveling by plane, the noise levels vary greatly at all stages. Pamela Mason of the American Speech-Language-Hearing Association said the noise is loudest during takeoff and landing, with the volume in the cabin reaching 105 decibels.

During the engine test run, during the performance inspection of the cabin air supply system, it was found that no air was ejected from the air supply nozzle in the cabin, but air was ejected from the exhaust port of the air-air radiator ejector.