Unconfirmed reports say the missing men are employed by Canada's Kenn Borek Air company.

BBC: Antarctic search for missing plane carrying Canadians

Kenn Borek Air Ltd. did not immediately return a message left by CNN on Friday night.

CNN: STORY HIGHLIGHTS

Kenn Kaufman knew at age 10 that he wanted to be the next Peterson, and at 16 he dropped out of school to start trying.

FORBES: Peterson's Progeny

The Twin Otter was operated by Calgary-based Kenn Borek Air Ltd.

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But I want to start by thanking Kenn for that very kind introduction and for all his leadership, his service to the community, his work on behalf of this campaign.

WHITEHOUSE: The White House

The condition of the three crew members on the Twin Otter operated by Calgary-based Kenn Borek Air Ltd. was not known nearly three days after the flight went missing and rescue attempts began.

CNN: STORY HIGHLIGHTS