As the flight waited to depart, officers could be seen grabbing the man from a window seat, pulling him across the armrest and dragging him down the aisle by his arms. Likewise, the Chicago Aviation Department has said only that one of its employees who removed Dao did not follow proper procedures and has been placed on leave. One passenger, a doctor who said he had patients to see, was removed by force. "What happened to my dad should never happen to any human being, regardless of circumstance", she says, and thanks the audience for their support.
Munoz is under pressure to contain a torrent of bad publicity and calls for boycotts against United unleashed by videos that captured Dao's rough treatment by airline and airport security staff.
But White House press secretary Sean Spicer said it was unlikely the federal government would launch a separate investigation.
Footage from the incident shows Dr Dao, bloodied and dishevelled, returning to the cabin and repeating: "Just kill me".
"If you're injured, or dragged off the airplane, or falsely arrested, you can sue", said Andrew Harakas, head of the aviation law group at Clyde & Co. Meanwhile, Dao himself was reportedly still recovering from the incident in a Chicago hospital on Wednesday.
And one would have thought that further sweeteners - United had offered compensation worth up to $800to passengers who agreed to leave the plane and take a flight the following day - might have coaxed one or two more customers from their seats.
The airline has admitted it was a mistake for police to forcibly remove a passenger who refused to give up his seat on a crowded plane. "Without a doubt. The airline has a right to control what happens on their planes", Rickman said.
In an ABC interview on Wednesday, Muñoz apologized to Dao, his family, and the passengers aboard the flight.
At first, the airline asked for volunteers, offering $400 and then when that did not work, $800 per passenger to relinquish a seat.
According to the airline's policy on electronic devices, passengers are free to take pictures and shoot video as long as they are "capturing personal events".
The incident has garnered the attention of over 480 million users on Weibo, a platform similar to Twitter in China, according to Reuters, with a passenger telling the publication that Dao said repeatedly that he was being discriminated against because he was Chinese.
But Delta Chief Executive Ed Bastian called overbooking a "valid business process" that is sometimes unavoidable due to weather delays and other factors.
"It's not a question in my opinion as to whether you overbook; it's how you manage an overbook situation", he said. They fell as much as 4.4 percent on Tuesday.
Two online petitions calling for Munoz to step down as CEO had more than 124,000 signatures combined by Wednesday afternoon.