Heimo stalks his best hunting grounds and Tyler tracks caribou as the pressure is on to get a big kill before the harsh Alaskan winter takes hold. Charlie inspects his traplines but damage from summer wildfires puts his season in jeopardy.

The Twetos brave the elements to deliver supplies to inaccessible areas.

Jim arranges to transport the casket of the dark winter's first casualty.

The Tweto family takes full advantage of Alaska's summer conditions.

The pilots brave the elements as hurricane-force winds roar into Alaska.

A Greenhorn pilot goes on the most challenging run of his short career.

The guys cope with an influx of teachers after the first snow.

Pilots embark on two white-knuckle flights involving something explosive.

Ariel's flying lessons end in disaster after a hard day of work.

Ariel attempts to learn the family business as Halloween takes over Alaska.

Luke takes on a daring rescue as winter's darkness overtakes Unalakleet.

Turbulence and angry passengers make for a long flight through Nulato.

Two pilots push their limits to land vital vaccines two miles from Russia on Alaska's most treacherous runway. In Unalakleet, Ariel Tweto takes to the skies once again and proves that she still has a lot to learn.

Luke delivers the first-ever ATM with a planeload of cash to Wainwright.

The team gets busy as Alaska recovers from two months of darkness.