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. Dao, who said he had patients to treat the next day, refused to be bumped from his fully booked flight in order to make space for airline staff.
The release does not mention any current or future action Dao may take against the city of Chicago - the entity that employed the aviation security officers who responded to United's call and ended up dragging Dao off of the plane against his will.
The carrier's CEO Oscar Munoz stressed that point in a letter sent on Thursday to customers, saying the airline will increase its focus on their satisfaction.
United Airlines also took out a full page advert in the Washington Post to apologise for the violent removal of the doctor, hoping to turn the page on its latest PR disaster. Dao was left with a concussion, a broken nose and two missing teeth, according to his attorney, Thomas Demetrio. After a man is dragged off a United Express flight on Sunday, April 9, 2017, United Airlines becomes the butt of jokes online and on late-night TV.
US Fed leaves rates unchanged amid slower economic growth
The confident tone of the statement fits with an important shift in the Fed's policy stance this year. Meanwhile, economists had expected the index to fall slightly to 52.0.
The settlement amount was kept confidential, per terms of the deal.
Last year Southwest bumped 15,000 passengers off flights, more than any other US airline.
The company's response in the immediate aftermath was widely criticized.
Southwest Airlines plans to stop overbooking flights - an industry practice implicated in an ugly incident on a United Airlines flight that has damaged United's reputation with the flying public.
His attorneys had said they planned to file a lawsuit against the city of Chicago and the airline. Long said Dao was verbally and physically abusive and was flailing his arms before he lost his balance and struck his mouth on an armrest.