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An American Airlines plane departs Joint Base Andrews in Maryland in 2015. American, United and Frontier all released statements on Wednesday saying they did not want to be involved in transporting migrant children who have been separated from their families because of a Trump administration policy. Patrick Smith/Getty Images hide caption

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Patrick Smith/Getty Images

Dunkin, a mastiff, is among the breeds that won't be allowed to fly in the cargo section of United Airlines flights as of June 18. He's shown at the Westminster dog show in February. Mary Altaffer/AP hide caption

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Mary Altaffer/AP

United Airlines planes parked at a terminal at O'Hare International Airport in Chicago. Kiichiro Sato/AP hide caption

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Kiichiro Sato/AP

After Passenger Dragging Last Year, Airlines Improved Performance

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A dog died aboard a United Airlines flight from Houston to New York's LaGuardia airport, prompting questions and outrage. Aaron M. Sprecher/Bloomberg via Getty Images hide caption

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Aaron M. Sprecher/Bloomberg via Getty Images

House Transportation and Infrastructure Committee ranking member Peter DeFazio, D-Ore., questions witnesses Tuesday during a hearing about about oversight of U.S. airline customer service. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images

United Airlines CEO Oscar Munoz in June 2016. He is appearing before a House committee today. Richard Drew/AP hide caption

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Richard Drew/AP

'It Was A Mistake Of Epic Proportions,' United CEO Testifies

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Thomas Demetrio, an attorney for David Dao, speaks at a news conference Thursday in Chicago. Dao was dragged from a United Express flight Sunday after he refused to give up his seat on the full flight from Chicago to Louisville, Ky., to make room for four crew members. Teresa Crawford/AP hide caption

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Teresa Crawford/AP

The fiasco with a United passenger being dragged off a plane illustrates the problem of enticing people to voluntarily give up their seats. Nam Y. Huh/AP hide caption

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Nam Y. Huh/AP

The United Airlines Fiasco: How Game Theory Could Help

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A United Airlines Boeing 737 is parked outside the Boeing 737 Delivery Center in Seattle in 2015. A passenger was forcibly removed from a flight from Chicago to Louisville, Ky., on Sunday. Stephen Brashear/Getty Images hide caption

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Stephen Brashear/Getty Images