One officer was placed on leave on Monday.
The officers' union contract prohibits the city from releasing their names, Pride said. Munoz called the incident "horrific" and promised to make changes in the future.
None of the officers, who are represented by Service Employees International Union 73, have been identified by city officials.
Munoz said he is "ashamed" as a result of the incident, calling the situation a "system failure".
In what has been denounced as a public relations blunder, the CEO of United, Oscar Munoz, which is named as a respondent, first apologized only for having to "re-accommodate" passengers, then blamed Dao.
"You saw us at a bad moment", he said. United had fully booked the flight but needed to provide seats for four airline employees who needed to get to Louisville for work.
Munoz issued a detailed apology, his second statement on the incident, late in the day Tuesday, and shares pared back their initial losses, closing the day down around 1 percent. But he did an about-face days later, saying the doctor did nothing wrong. "And that's something that I've learned from".More news: Nicolas Maduro donates $500000 to Trump fund
But apparently, Munoz should get one, because his handling of the situation was lacking both expertise and empathy.
"He can't be. He was a paying passenger sitting on our seat in our aircraft, and no one should be treated like that". United acknowledged that passengers may have been less willing to listen to offers once they were seated on the plane.
Munoz has yet to get in touch with Dr. Dao directly, but as we previously reported, the 69-year-old has already hired two prominent Chicago lawyers to presumably take United Airlines to court!
It's unclear what form that compensation will come in, notes Bloomberg, as a company spokeswoman declined to say if it will be in cash, frequent-flier miles, or some other form.
Still, outside O'Hare, protests continued on Wednesday. "I think that they'll follow through". They care about their customers. "They all have an incredible amount of common sense and this issue could have been solved by that".
Passengers agree to a litany of terms in any airline's "contract of carriage", which they agree to when purchasing a ticket. "The real question is, at what point did the airline think this is no longer their problem and turns this over to the police?" Many have called for a boycott of the airline. A protest was held Tuesday night at O'Hare. The Reverend Jesse Jackson carried a sign that read,"Beat your competition, not your customers".