Helsinki’s airport will be the first in the world to track passengers to within feet.

The plan is being hailed as a technological breakthrough — and is drawing scrutiny from privacy advocates.

Sensors will monitor all mobile phones with Wi-Fi access turned on from parking lot to takeoff, helping to observe crowding and prevent bottlenecks at the two-terminal airport which 15 million fliers pass through a year. Passengers opting in through an application will also receive offers from shops and restaurants, as well as gate and flight information.

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