airport security airport security

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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Scott Olson/Getty Images

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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Danny Moloshok/Reuters/Corbis

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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Jonathan Bachman/AP

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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Nam Y. Huh/AP

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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Scott Olson/Getty Images