Mel Coulter of the Idaho Transportation Department said aircraft had been flying as late as Wednesday over rugged mountains where the single-engine Beechcraft disappeared near Yellow Pine, about 150 miles north of Boise.
But Coulter said worsening conditions and safety concerns nearly two weeks after the plane vanished prompted crews to "reluctantly" halt operations Thursday.
Aboard the six-seat plane were pilot, Dale Smith, a software executive from San Jose, Calif.; his son, Daniel Smith and his wife, Sheree Smith; and daughter Amber Smith with her fiancé, Jonathon Norton.
Family and friends who have also been searching for the plane announced this week their efforts were winding down, too.
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