When Have You Boarded a Plane?
FutureLawyer weighs in on the United Airlines controversy (and if you haven't heard about it you have been in a cave) to note that the definition of when one has boarded a plane is unclear.
It would seem to me that there could be other circumstances when the airline might not want to argue that a passenger who is on the plane has not boarded until the plane takes off. Another factor is most people would argue that when you are on the plane and in your seat, you have indeed boarded the plane.
All of this does not necessarily side with the doctor who was dragged off the plane. Althouse discusses that aspect.