Lawyers for Dao have moved to preserve evidence from the flight, filing a motion to keep surveillance videos and other materials related to United Flight 3411 in preparation for a possible lawsuit.
Dao said he was a doctor and had to get home to patients.
Dao's lawyer said he suffered from a concussion and a broken nose in addition to losing two teeth in the incident.
The increases came after United came under fire after it called security officers to forcibly remove passenger David Dao from an overbooked flight in order to seat crew members for another flight. While people overwhelmingly chose American over United when conditions were the same, small adjustments in the flights gave United much better odds.
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Bumping passengers is permitted by the US Department of Transportation as long as airlines provide some compensation - typically a voucher for future purchase - and a seat on a later flight.
Almost a week since the incident, United is still dealing with the backlash.
Chicago could also be sued, as the aviation security officers were hired by the city.
United spokeswoman Maggie Schmerin said in an email Sunday that the change is an initial step in a review of policies and it's meant to ensure that situations like Dao's never happen again. Munoz himself said on Wednesday that he had left a message for Dao. Video evidence later disputed that Dao was acting aggressively.
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The union for the airline's pilots issued a statement Thursday seeking to distance them from the incident, pointing out that it happened on a United Express carrier that is "separately owned and operated by Republic Airline" and that United pilots weren't flying the jet.
The three officers who removed Dao have been suspended from their jobs at the Chicago Aviation Department. 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.
"There are no excuses", Alderman Michael Zalewski said.
The department's roughly 300 officers guard the city's two main airports but are not part of the regular Chicago police force, receive less training and can not carry guns inside the terminals.
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Speaking to Fox News , the USA president said of the aircraft carrier's re-routing: " We are sending an armada , very powerful". The Vinson , as I said on the record, was operating up and down the Western Pacific and we were doing exactly what we said.