United Airlines has a reached a settlement for an undisclosed sum with the passenger who was dragged from a Chicago flight earlier this month in an incident that sparked international outrage, an attorney for the passenger said on Thursday.

Dr. David Dao, a 69-year-old Vietnamese-American doctor, was hospitalized after Chicago aviation police dragged him from the plane to make space for four crew members on the flight from the city's 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 announcing the settlement.

"We are pleased to report that United and Dr. Dao have reached an amicable resolution of the unfortunate incident that occurred aboard flight 3411," United said in a separate statement. "We look forward to implementing the improvements we have announced, which will put our customers at the center of everything we do."