DroneCrew members on three commercial flights arriving in New York over the weekend spotted drones near their planes while approaching the airport.

A small plane was also forced to change direction to avoid a drone in southern New Jersey on Sunday.

Aviation experts said such incidents present a clear safety concern that warrants more attention amid growing interest in unmanned aircraft systems, or drones. The Consumer Electronics Association, a technology trade group, expect unit sales of drones to approach 700,000 in 2015, a 63 percent increase over last year.

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