According to Pilatus' website, the current PC-12 model of the single-engine turboprop plane lists a maximum capacity of one pilot and 10 passengers.
Knudson said nine people were killed and three were injured.
The Hansens had been executives with Conrad & Bischoff, Kyäni and KJ's Tremendous Shops in Idaho, in keeping with the outlet.
Federal investigators had yet to reach the crash site on Sunday because of harsh wintry weather.
The Federal Aviation Authority (FAA) said it was aware of the crash. At least nine people were killed, including children, and three others are believed to have survived.
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The Hansens have been actively involved in the Idaho Falls community.
The conditions also delayed efforts to inspect the scene, authorities said, though all bodies were removed from the wreckage by Saturday afternoon. I was one of them, "recalled Darin Skidmore to the Statesman of Idaho". Over the years, Jim Sr. always kept track of me and made time for a conversation... "They will never know the many lives they touched".
Kevin Call, the owner of Farr Candy Company, described the news of the plane crash as "heartbreaking".
"The legacy of Jim Hansen, Kirk Hansen and their father Jim Hansen Sr., will be preserved and will flourish through their families and established Business Partners today, tomorrow and into the future", a statement from the family said. "Their influence in the community and in the church will be strongly felt".