Three Aviation Department police officers got on the plane.
"I understand you might bump people because a flight is full", Fearns said. One reads: "The fact that your security dragged a passenger out of your plane & bloody his face is beyond appalling it enters the realm of torture".
Dr Golan is one of two lawyers hired by the doctor's family, raising the possibility the father of five could be planning to sue United Airlines.
In an effort to calm the backlash, United also announced that passengers on United Express Flight 3411 would be compensated equal to the cost of their tickets.
The passenger dragged off the United plane in Chicago was forced to give up his seat not because of traditional overselling but because another kind of overbooking: A crew needed to commute for a flight the following day, and the flight was full. "But to just randomly say, 'You're getting off the plane, ' that was awful".
Munoz said he was committed to "fix what's broken so this (the incident) never happens again".
One of the officers involved was placed on administrative leave Monday.
The department said it is continuing its investigation. On Thursday, the city's aviation commissioner is expected to address a city council committee about the incident.
Video of the incident has been shown around the world. The head of United's parent company has scrambled to contain the damage to the carrier's reputation.
"That is not who our family at United is", he said.More news: Canadian Def Minister arrives; to explore boosting def ties
"It's not so much what I thought, it's what I felt", he told ABC.
The chief executive of United Airlines has issued another apology for an incident in which a passenger was injured when being forcibly removed from an overbooked flight, after initially defending the company. Those documents are often the first steps toward a lawsuit. The passengers who would have to be kicked off were to give way to four crew members of another flight who needed to be given seats on this particular flight, CNN confirmed. He refused to leave. He has promised to review the airline's passenger-removal policy. This, the airline said, was in accordance with the airline's contract of carriage.
The footage taken inside the airliner shows a man being pulled out of his seat and dragged, screaming, down the aisle.
U.S. media published an email Munoz sent earlier to employees, in which he said the passenger "defied" authorities and "compounded" the incident.
After the passenger was removed, the four airline employees boarded the plane.
Emirates Airlines trolled the company with a video advertisement released Tuesday that started by quoting United CEO Oscar Munoz, who told airline trade publication ATW in March that "Those [Gulf] airlines aren't airlines".
Representative Dan Lipinski who sits on the House Transportation Committee says he plans to create an amendment to the FAA authorization bill next month to make sure this type of situation isn't repeated.
An attorney for Dao's family said he is in a Chicago hospital getting treated for his injuries.
He was convicted more than a decade ago of fraud involving prescribing of drugs and spent years trying to regain his licence, during which he turned his hand to professional poker.