MADRID — Security workers checking carry-on luggage at *********’s airport have resumed partial strikes that threaten more queuing ***** 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.

The stoppages, begun last weekend, were resumed after a pay increase of 200 euros ($235) a month negotiated by the regional Catalan government and the security company Eulen was voted down by a majority of the some 350 workers Thursday.

Passengers flying from ********* have been suffering delays of several hours to reach the boarding area in recent weeks because of the dispute, which comes in the busy summer period.