FILE - In this March 22, 2016, file photo, a Chicago Police K-9 officer and his dog walk through a terminal at O'Hare International Airport in Chicago. The Chicago Department of Aviation announced Wednesday, July 12, 2017, a new directive designating Chicago Police officers as the lead on all disturbance calls at the airports, in addition to those on aircrafts. This new directive comes after the CDA's review of the Aviation Security Division after a United passenger was forcibly removed by Aviation Security officers in April. (AP Photo/Teresa Crawford, File)
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