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than 10 s. 40 , 53 Because of this uniquely dry environment in flight, the cabin presents an unusual situation where virtually all exhaled virions (particles containing viable virus) remain aloft as aerosols and do not alight onto surfaces due to gravity. Once aerosolized, the only opportunity for mitigation is to disinfect exhaled viruses and inactivate them while airborne (i.e., between passengers), either by continual ventilation and/or continuous UV disinfection. Surfaces (fomites) are not a primary path for respiratory viral infections such as corona and