The videos show the man screaming as police officers pulled him from his seat. Three of them did but the fourth refused.
On twitter, United's CEO called the event upsetting and said they are conducting their own review, including reaching out to the passenger directly. A witness told The Washington Post the victim said: "I'm being selected because I'm Chinese".
One man who was selected refused to leave, prompting airport security guards to forcibly remove him from the plane.
The Chicago Department of Aviation said in a statement the officer involved was placed on leave and the incident "was not in accordance with our standard operating procedure and the actions of the aviation security officer are obviously not condoned by the Department". "Oh my God!" a female passenger is heard saying on the video. When that occurs, airlines are required to first offer volunteers compensation in exchange for their seats before bumping someone involuntarily. According to eyewitnesses, the man claimed he was a doctor and needed to get home that evening. One couple cooperated and left. "They are letting the market decide and each airline decide how much they are going to compensate". Passengers on the plane were audibly distressed by the incident.
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"He said that he had patients that he needed to see in the morning, that he was a medical doctor and that he could not miss this flight", Klaassen said. "We apologize for the overbook situation", United said.
"Flight 3411 from Chicago to Louisville was overbooked", a United spokesperson told Yahoo News when asked about the incident.
Another video shows him, still disheveled from the altercation, returning to the cabin, running to the back of the plane and repeating: "I have to go home".
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The email says the situation was "unfortunately compounded when one of the passengers we politely asked to deplane refused and it became necessary to contact Chicago Aviation Security Officers to help".
Jayse D. Anspach, a passenger on the flight from Chicago to Louisville, described the incident on Twitter.
Passenger Audra D. Bridges posted the video on Facebook.
According to the Associated Press, United had offered $400 and then $800 vouchers and a hotel stay for volunteers to give up their seats.
Bridges said when the flight did depart a United employee apologized to passengers.
Late last month, two teenage girls dressed in leggings were denied boarding on a United flight from Denver to Minneapolis due to their form-fitting trousers.
An airline supervisor walked onto the plane and brusquely announced: "We have United employees that need to fly to Louisville tonight..."