Airline passengers around the world were upset when videos of a man being dragged off a United Airlines flight came out on Sunday night. The videos showed blood on the man’s face after his confrontation with the police. The airplane was completely full, but four airline employees still needed to get on the flight from Chicago to Louisville, Kentucky. So, the airline asked passengers to give up their seats in return for money and the chance to take another flight the next day. It is a common practice for airlines when they do not have enough available seats on a flight. No one volunteered. So the airline said it would make a selection itself. Three people decided to leave the plane without a problem after being told they had been chosen. But one man resisted. The newspaper in Louisville reported Tuesday his name is David Dao. Passengers say Dao told the airline crew he was a doctor and had patients to see on Monday. Dao is 69. He has been practicing medicine in the U.S. since the 1970s. Some passengers said Dao said he thought he was chosen to leave the plane because he was Chinese. A different news report and another passenger said the man was originally from Vietnam. Airline employees asked police to help remove the man from his seat. Videos of the incident quickly showed up on Twitter and Facebook. They showed Dao being dragged off the plane.