A low, dense cloud is causing serious delays at Logan International Airport.
Visibility is down to below a quarter of a mile due to the fog.
According to the FAA, arrivals are being delayed by an average of an hour and six minutes. Departures may be affected by the late arrivals.
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Higher in the air, the sky is clear.
The fog could continue impacting flights through midday Saturday.
Travelers planning to fly into or out of Logan should check with their airlines.
Stay with necn as this story develops.