CEO of United & other airlines grilled in D.C. on Tuesday over customer service

United Airlines CEO Oscar Munoz apologized Tuesday on Capitol Hill for an incident in which a passenger was forcibly removed from a flight and vowed to do better as he and other airline executives faced tough questions from lawmakers.

Munoz told a congressional hearing that passenger David Dao was treated in a way that no customer - or individual - should be treated, calling it a "terrible experience" that should never be repeated.

• United to offer up to $10,000 to bumped passengers

United has taken a series of steps to reduce overbooking of flights since the April 9 incident and will raise to $10,000 the limit on payments to customers who give up seats on oversold flights, Munoz said. The airline also said it will improve employee training.

"This is a turning point for United, and our 87,000 professionals," Munoz said. "It is my mission to ensure we make the changes needed to provide our customers with the highest level of service and the deepest sense of respect."

The hearing by the House Transportation Committee comes amid worldwide outrage sparked when Dao was dragged off a United flight after refusing to give up his seat to a crew member. The incident ignited a debate about poor service and a lack of customer-friendly policies on U.S. airlines.

Transportation Committee Chairman and Pennsylvania Republican Bill Shuster said the hearing will give lawmakers "an opportunity to get much-needed answers about airline customer service policies and what is being done to improve service for the flying public."

United moved to head off criticism last week by reaching a settlement with Dao and issuing new policies designed to prevent customer-service failures. United and lawyers for Dao have declined to disclose financial terms of the settlement.

United President Scott Kirby joined Munoz at the hearing, along with top executives of American Airlines, Alaska Airlines and Southwest Airlines.

• Why airlines overbook planes and what passengers can do about it

Dao's attorney has praised the airline and Munoz for accepting responsibility and not blaming others, including the city of Chicago, whose airport security officers yanked Dao from his seat and dragged him off the United Express plane.

Dao was waiting to fly to Louisville, Kentucky, on April 9 when the airline decided it needed four seats for Republic Airline crew members who needed to travel to work on another United Express flight in Louisville the next morning. When Dao and his wife were selected for bumping, he refused to leave.

Video of the incident has sparked more than two weeks of withering criticism and mockery of United. Munoz initially blamed Dao, but later said he was horrified by the event and called it a failure on United's part.

United has vowed to reduce - but not eliminate - overbooking, which occurs when more tickets are sold than there are seats on the plane.