United Airlines CEO Oscar Munoz said he was ashamed of a now infamous video that shows a bloodied passenger being dragged from one of his airline's planes, and declared that such an incident would "never happen again". "And you saw us at a bad moment and this could never - will never happen again on a United Airlines flight".
The filing with the Cook County Circuit Court likely presages an eventual lawsuit against United for the April 9 incident, where Dao was snatched from the seat he had paid for, and was dragged by his hands on his back off the parked plane, which had been bound for Louisville, Kentucky.
In a news release, the attorneys say they plan to talk to the media and that they will be accompanied by a relative of Dr. David Dao.
In his most contrite apology yet, Oscar Munoz said Tuesday that no one should be mistreated that way.
Munoz - who last month was named "US Communicator of the Year" by PR Week - pledged a "thorough review" of the airline's procedures and said the carrier would not send law enforcement officials onto planes remove passengers.
The passenger was identified as Dao, a 69-year-old physician from Elizabethtown, Kentucky. He has promised to review the airline's passenger-removal policy.
The event stemmed from a common air travel issue - a full flight.
A lawyer for a man dragged off a United Express flight says he suffered a concussion and broken nose and lost two front teeth. His legal team planned to hold a news conference Thursday to discuss the matter with reporters.
Much of the outrage centred on the fact that Mr Dao was a paying passenger who had been removed from the Chicago to Louisville flight to make way for additional crew members.
A lawyer for a man dragged off a United Express flight says airlines have "bullied" passengers "for a long time".
"I was hired to make United better and we've been doing that and that's what I'll continue to do", Munoz said.
Attorneys representing a man who was dragged off a United Express flight in Chicago and a member of the man's family are set to talk about the incident on Thursday.
They're also seeking cockpit voice recordings, incident reports and other materials.
A video of the man being pulled from his seat after he refused to leave the full plane has been seen around the world and resulted in harsh criticism for United and Aviation Department police.
That's when three Aviation Department police officers boarded the plane.
The video of a man being dragged off a United Express flight shined an unwanted spotlight on the police force that guards Chicago's two main airports and could threaten the agency's future.
Also Wednesday, a Chicago alderman said representatives from United and the city's Aviation Department have been summoned before a city council committee to answer questions about the confrontation at O'Hare Airport.