The CEO and other United Airlines executives had comments and took questions Tuesday from reporters about the passenger incident on a plane last week.
There will be no one fired as a result of United Airline's worst crisis, CEO Oscar Munoz said.
United Airlines chief executive Oscar Munoz.
United already has announced some policy changes such as no longer having law enforcement remove customers from flights and requiring employees to sign in at least 60 minutes before the flight.
For those unfamiliar with the situation, here's a quick recap of the story so far: On April 9, United asked for volunteers to be bumped off a flight from Chicago to Louisville so that airline crew members could catch the flight.
Last week, Dr. David Dao was forcibly dragged from his seat on a United flight as the crew attempted to clear space on the overbooked flight for crew members. David Dao, a 69-year-old Kentucky physician, was bloodied and dragged off the plane by Chicago airport officers who had been summoned by United employees when Dao wouldn't give up his seat.
"I want to know why this happened, how it was allowed to occur and what protocols are in place to handle overbooked flights", said Rep. Rodney Davis, R-Ill.
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"Your agency must conduct a swift, sweeping investigation into United Airlines and the industry practices that led to this incident", wrote Blumenthal.
His latest apology came as surveys in the U.S. hinted at the damage the incident has done to United's reputation.
According to Munoz, there was "never consideration" of firing any employees over the incident, which sparked outrage around the world after video footage of Dao's treatment went viral online. He also repeated his characterization of the incident as a "system failure", and he described the entire experience as "a true learning opportunity" and "a watershed moment for our company", the report added.
Dao's lawyer said the senior citizen incurred a significant concussion, suffered a broken nose and lost two front teeth in the incident, and that he would likely sue the airline, which also drew scorn after banning two young women wearing yoga trousers from a flight.
Mr Munoz has declined to address that change until the airline finishes an internal review.
"We are looking at a broad array of issues", Munoz said.