A hearing scheduled on Monday was cancelled after United and the city of Chicago agreed to Dr Dao's request to preserve and protect evidence, Mr Demetrio's office said on Saturday.
For whatever reasons the staff of the jet saw fit, they made a decision to ask David Dao, a 69-year-old Vietnamese-American doctor, to leave the airplane.
United initially said Dr Dao's flight, from Chicago's O'Hare International Airport to Louisville, Kentucky, was overbooked, and its staff picked passengers to be bumped.
It also exposed a corporate culture in which airlines - and United in particular - have long "bullied" passengers, he said.
The practice has been questioned, however, since David Dao, 69, was violently dragged off a sold-out United Express flight last weekend. However, instead of prohibiting overbooking, Trump proposed that the ceiling on what incentives airlines can give passengers in return for their seats when flights are overbooked should be done away with.
The backlash was not limited to United's domestic territory and calls for boycotts emanated from as far as Vietnam and China.
United's board said on Friday the company had to craft policies to win back customer trust and apologized to Dao and his family. "I deeply apologize to the customer forcibly removed and to all the customers aboard", Munoz said of the passenger he seemed to fault in his letter to employees. If there aren't enough volunteers, airlines can pick passengers - on United, those who paid more for a ticket or fly frequently are less likely to be selected.
United had selected Dao and three other passengers at random for removal from the plane after unsuccessfully offering the vouchers and a hotel stay to customers willing to give up their seats.
The attorney was unable to say precisely how Dao was injured. At some point, Dao went limp, and the officer dragged him off the plane.
"There are no excuses", Alderman Michael Zalewski said.
Community members protest the treatment of Dr. David Dao, who was forcibly removed from a United Airlines flight on Sunday by the Chicago Aviation Police, at O'Hare International Airport in Chicago, Illinois, U.S., April 11, 2017. "It reflected badly on the airline, the City of Chicago, and the State of IL".
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