As the flight waited to depart from Chicago's O'Hare Airport, officers could be seen grabbing the screaming man from a window seat, pulling him across the armrest and dragging him down the aisle by his arms. The airline was trying to make room for four of its employees on the flight last evening to Louisville, Kentucky.
Other passengers on Flight 3411 are heard saying, "Please, my God", "What are you doing? This is wrong", "Look at what you did to him" and "Busted his lip".
"We almost felt like we were being taken hostage," Tyler Bridges said. "We were stuck there. You can't do anything as a traveller. You're relying on the airline."
When airline employees named four customers who had to leave the plane, three of them did so. The fourth person refused to move, and police were called, United spokesman Charlie Hobart said.
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Oscar Munoz, CEO of United Airlines' parent company, described the event as "upsetting" and apologised for "having to re-accommodate these customers". He said the airline was conducting a review and reaching out to the passenger to "further address and resolve this situation".
When the manager approached the passenger, he said he was a doctor who needed to see patients in the morning, Bridges said.
Two officers tried to reason with the man before a third came aboard and pointed at the man "basically saying, 'Sir, you have to get off the plane'", Bridges said. That's when the altercation happened.
"People on the plane were letting them have it," he said. "They were saying you should be ashamed to work for this company."
A few minutes later, the man who was removed from the plane returned, looking dazed and saying he had to get home, Bridges said. Officers followed him to the back of the plane. Another man travelling with high school students stood up at that point and said they were getting off the plane, Bridges said.
About half of the passengers followed before United told everyone to get off, he said.
Bridges' wife told him she saw the man taken away on a stretcher, he said.
After a three-hour delay, the flight took off without the man aboard, Bridges said. A United employee apologised to passengers, he said.
Airlines are allowed to sell more tickets than there are seats on the plane, and they routinely overbook flights because some people do not show up.
It's not unusual for airlines to offer travel vouchers to encourage people to give up their seats, and there are no rules for this process. When an airline demands that a passenger give up a seat, the airline is required to pay compensation of double the passenger's fare, up to USD 675, if the passenger can be placed on another flight that arrives one to two hours later than the first flight, or four times the ticket price, up to USD 1,350, for longer delays.