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In this April 25, 2012, file photo, an airplane lands at Newark Liberty International Airport in Newark. More travelers are flying than ever before, creating a daunting challenge for airlines: continue to keep passengers safe in an ever more crowded airspace. (AP Photo/Julio Cortez, File)

In this April 25, 2012, file photo, an airplane lands at Newark Liberty International Airport in Newark. More travelers are flying than ever before, creating a daunting challenge for airlines: continue to keep passengers safe in an ever more crowded airspace. (AP Photo/Julio Cortez, File)

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