"That is not who our family at United is", Munoz said.
United Continental Holdings Inc. will compensate all passengers for the cost of the flight in which a man was forcibly removed by security officers.
In the hours following the incident, United wrestled with how to respond.
Video of police officers dragging the passenger from the overbooked flight sparked uproar.
The department announced today that two more officers have been placed on leave.
Oscar Munoz said in a note to employees he continues to be disturbed by the events on Sunday night in Chicago.
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Attorney General Mukul Rohatgi urged the court to direct Mallya to bring back the $40 million, which he had received from Diageo. Meanwhile, Union Law Minister Ravi Shankar Prasad said that India had put up "a strong case against Vijay Mallya in England".
United's explanation "has been unsatisfactory, and appears to underestimate the public anger about this incident", four senators wrote in letters on Tuesday to Mr Munoz and Ms Ginger Evans, commissioner of the Chicago Department of Aviation. The head of United's parent company has scrambled to contain the damage to the carrier's reputation.
Paul Callan, a civil and criminal trial lawyer in NY, said the public outcry over Dr Dao's treatment is likely to push the airline to a quick and generous settlement.
Christie did not say if the administration responded to his request, but said he had yet to hear back from United officials about his concerns.
Dao's attorneys at the law firm Corboy & Demetrio said they would hold a news conference on Thursday to discuss the petition.
On Wednesday, his legal team asked an IL court to order United to preserve surveillance footage, a cockpit voice recording, and other information related to the flight, reports the Times.
The footage, captured by a passenger sat directly behind Dr David Dao, shows the Kentucky physician telling police he would rather go to jail than get off the plane, saying "you can drag me".
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According to a report on Cadena COPE , which was confirmed by AS, Liverpool are keen on the Spaniard and offered €50m to sign him. It seems somewhat questionable that Liverpool would make such a huge bid for a player unlikely to leave Real Madrid .
In reply to this previous statement of Munoz, the Dubai-based airlines emphasized their current standing on TripAdvisor as the best airline. Three other passengers eventually agreed to leave, but Dao insisted he needed to return home to care for patients.
Tomorrow the Chicago city council's aviation committee will also be making sure this doesn't happen again.
The others complied. After Dao refused, airport security officers yanked him out of his seat and dragged him off the plane. When no one voluntarily came forward, United selected four passengers at random. But he then reiterated his desire to see that policy reviewed. ABC News' Rebecca Jarvis asked him why it took so long for him to offer a more heartfelt apology.
He also called the forcible removal "truly horrific".
Speaking of his employees, Munoz said: "They all have an incredible amount of common sense, and this issue could have been solved by that".
As we later found out, the man removed the the flight was reportedly a 69-year-old doctor who had a ticket for the flight.
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However, they were dealt a blow when slack defending allowed Saul to plant his close range headed effort beyond Kasper Schmeichel. Shinji Okazaki and Yohan Benalouane were taken off, as Ben Chilwell and Leonardo Ulloa were introduced.
Surveillance video recordings depicting the boarding of all passengers.