Does 'During the first broadcast, the captain or first officer could be heard declaring Mayday amid the sounds of a physical struggle in the cockpit.' logically set the stage for the hypothesis 'The captain or first officer declared Mayday in the cockpit.'
During the first broadcast, the captain or first officer could be heard declaring Mayday amid the sounds of a physical struggle in the cockpit.###The captain or first officer declared Mayday in the cockpit.