United Airlines and the passenger who was dragged from a Chicago flight earlier this month have reached a settlement for an undisclosed sum, they said on Thursday, in the carrier's latest step to contain damage from an incident that sparked international outrage.

Viral videos of Dr. David Dao being dragged down the aisle of a United jet and Chief Executive Oscar Munoz's handling of the incident touched off a public outcry, prompted calls from congressmen for new industry regulation, and led United's board of directors to reverse an agreement to make Munoz company chairman in 2018.

United said earlier on Thursday that it would offer passengers who give up their seats up to $10,000, reduce overbooking of flights and no longer call on law enforcement officers to deny ticketed passengers their seats.

Southwest Airlines also said on Thursday that it would end overbooking of flights.

Dao, a 69-year-old Vietnamese-American doctor, was injured when Chicago aviation police removed him from his seat and then dragged him from the plane to make space for four crew members on the flight from O'Hare International Airport to Louisville, Kentucky.

United has taken "full responsibility for what happened on Flight 3411, without attempting to blame others, including the City of Chicago," Thomas Demetrio, an attorney for Dao, said in a statement.

Demetrio said there was no need to proceed with separate litigation against the city. Republic Airways, United's regional partner which operated the flight that Dao was on, has also been released from responsibility as part of the settlement, Demetrio's office said.

Chicago Mayor Rahm Emanuel's office declined to comment on the settlement.

The three Chicago Department of Aviation officers who pulled Dao off the plane and a supervisor involved in the incident remain on paid leave, said Chicago Department of Aviation spokesman Karen Pride, who declined to comment on the settlement.

A United Airlines Boeing 787 taxis as a United Airlines Boeing 767 lands at San Francisco International Airport, San Francisco, California, U.S. on February 7, 2015. Photo: Reuters

United said in a separate statement that it was pleased to reach "an amicable resolution of the unfortunate incident that occurred aboard flight 3411."

"We look forward to implementing the improvements we have announced, which will put our customers at the center of everything we do," the airline said.

Munoz stressed that point in a letter sent on Thursday to customers, saying the airline would increase its focus on their satisfaction.

"We can never say we are sorry enough for what occurred, but we also know meaningful actions will speak louder than words," he said.

Separately, officials at 10 of the busiest U.S. airports said their rules prevent security officers from physically removing passengers from airplanes unless a crime is committed.