Original Message

A crewmember!   FAR 1.1 clearly defines crewmember!  

   "Crewmember means a person assigned to perform duty in an aircraft during flight time."

Where do you come up with them just being passengers?   The patient is a passenger, not the medical crewmember!

FAR 91.17 applies to crewmembers, which includes medical crewmembers assigned to perform duty in an aircraft during flight time!