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Passengers wait to pass the security control at the Barcelona airport in Prat Llobregat, Spain, Friday, Aug. 11, 2017. Security workers checking carry-on luggage at Barcelona's airport have resumed partial strikes that threaten more queuing chaos for passengers at one of Europe's busiest airports. The workers say they will stage four one-hour strikes Friday and Sunday followed by a 24-hour stoppage Monday. (AP Photo/Manu Fernandez)