Air Traffic Controllers
FILE - In this Aug. 10, 2009, file photo, the wreckage of a helicopter that was hit by an airplane and crashed in the Hudson River is repositioned by a crane on a pier in Hoboken, N.J. For the third time in seven months, the judgment of those who operate the nation's air traffic control system has been called into question and raised concerns that the system may not be as safe as officials claim.(AP Photo/Seth Wenig, File)
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