Alaska's Toughest Pilots: The Iron Dog is known as the longest, toughest, most extreme snowmobile race in the world. Racers brave wildly dangerous terrain, bitterly cold temperatures, and speeds well over a hundred miles an hour in this two-thousand-mile endurance race. To make their journey possible, the snowmobile racers on the ground rely on their Alaska Wing Men to be their flying "pit-crew."

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