United Airlines forcibly removes passenger from overbooked flight 'Look at what you did to him': video shows man being dragged from aircraft by guards: CBC News A man was forcibly removed from a United Airlines flight from Chicago to Louisville, Ky., on Sunday, after the flight was overbooked and the passenger refused to adhere to the airline's decision to randomly remove four passengers. 

1. Why did the aviation police drag down the passenger? 

2. Why did the old man refuse to leave? 

3. Does the airline company have the right to remove a passenger from the plane with no valid reasons?