Lines of travelers at Denver International Airport snake their way through security on Thursday. RJ Sangosti/Denver Post via Getty Images hide caption

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Cities Consider Privatizing TSA To Speed Up Checkpoints, But Would It?
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TSA agents work at a security checkpoint at Newark Liberty International Airport in New Jersey on Monday. The House committee says the head of security for TSA has been removed from his post after inquiries into the agency's management. Mel Evans/AP hide caption

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Passengers at O'Hare International Airport wait in line to be screened at a Transportation Security Administration (TSA) checkpoint. Scott Olson/Getty Images hide caption

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Security Lines Are Interminable, But With Good Reason
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Passengers wait in line to be screened at a Transportation Security Administration checkpoint at Chicago's O'Hare International Airport on Monday. Scott Olson/Getty Images hide caption

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Faced with the prospect of long wait times at airports this summer, Homeland Security is boosting its checkpoint staffing. In this photo from December, passengers line up to go through security at the Fort Lauderdale-Hollywood International Airport. Wilfredo Lee/AP hide caption

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Passengers wait to check in at Chicago's O'Hare International Airport in June 2015. TSA screenings at U.S. airports are beyond ticket counters, baggage claim and other heavily trafficked areas. After terrorist bombings at the Brussels airport targeted those areas, U.S. officials are reconsidering how to keep them safe. Scott Olson/Getty Images hide caption

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Officials Consider How U.S. Airports Could Stop A Brussels-Style Attack
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A man is screened with a backscatter X-ray machine as travelers go through a security checkpoint at Los Angeles International Airport in 2011. Danny Moloshok/Reuters/Corbis hide caption

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The ramp to departures is blocked by emergency vehicles at the New Orleans International Airport on Friday night in Kenner, La. Jonathan Bachman/AP hide caption

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TSA agents, like this one at Chicago's Midway International Airport, discovered more than 2,000 firearms at the nation's airports last year — the overwhelming majority of them loaded, according to new data. Nam Y. Huh/AP hide caption

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A sign informs travelers about Millimeter Wave Detection technology used in full body scanners at Midway Airport in Chicago. The scanners produce less-revealing images than those that use X-rays. Scott Olson/Getty Images hide caption

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