The disturbing footage shows the man was left bleeding from the mouth after his face was smashed against an arm rest during the incident which occurred on a United Airlines flight ,before it left Chicago for Louisville, Kentucky.
The person who filmed the footage tweeted: "Not a good way to treat a doctor trying to get to work because they overbooked."
"After our team looked for volunteers, one customer refused to leave the aircraft voluntarily and law enforcement was asked to come to the gate.
"We apologise for the overbook situation."
