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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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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An instructor conducts a training session at Transportation Security Administration Academy at the Federal Law Enforcement Training Center, located at a sprawling former air base in Glynco, Ga. Brian Naylor/NPR hide caption

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Body Scanners And Explosives: TSA Starts Academy For Screeners

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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 workers sing at Los Angeles International Airport in this screen grab from a USA Today video. The chorus dons Santa hats during the holiday season and perform in the middle of the airport. USA Today hide caption

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At LAX, TSA Workers Sing Cheer Into Holiday Travel

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A woman passes by a security sign at Seattle-Tacoma International Airport on Friday. Ted S. Warren/AP hide caption

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TSA: Unpredictability Is Part Of Security Process

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TSA Is 'Far Behind The Curve' On Security, Lawmaker Says

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