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

United Airlines airplanes sit on the tarmac March 15 at LaGuardia Airport in New York. The company is struggling with the public relations fallout from its violent removal of one of its passengers. Seth Wenig/AP hide caption

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Seth Wenig/AP

How To Not Get Bumped From A Flight, And What You're Entitled To If You Are

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A screenshot of video showing a passenger forcibly removed from a United Airlines flight from Chicago to Louisville, Ky., on Sunday. Jayse D. Anspach/Screenshot by NPR hide caption

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Jayse D. Anspach/Screenshot by NPR

Passenger Forcibly Removed From United Flight, Prompting Outcry

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Passengers check in for flights with United Airlines at Chicago O'Hare International Airport. United, American and Delta now offer no-frills "basic economy" fares. Scott Olson/Getty Images hide caption

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Scott Olson/Getty Images

New 'Basic Economy' Airfares May Not Be As Cheap As You Think

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United Airlines planes sit on the tarmac at San Francisco International Airport on July 8, grounded by a computer glitch. Some 3,500 United passengers around the world were delayed. Justin Sullivan/Getty Images hide caption

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Justin Sullivan/Getty Images

United Airlines Faces Steep Ascent In Not-So-Friendly Skies

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A United Airlines 747-400 taxis at San Francisco International Airport in 2011. A group of flight attendants have filed suit against the airline to contest their firing over their handling of a perceived safety threat. Eric Risberg/AP hide caption

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Eric Risberg/AP