Jim searches for a group of missing mountain climbers lost somewhere in Alaska's Brooks Range.

The Iditarod dog sled race brings big business to Era Alaska. Ferno, Ayla and Ariel Tweto run with the reindeer in Anchorage. A pilot battles malfunctioning trim control over the frozen Norton Sound and a tsunami warning threatens the entire West coast.

Era Alaska provides aid to a village devastated by heavy flooding. Two pilots get lost in a sea of fog off the Russian coast while trying to deliver desperately needed ammunition. In Anchorage, Jim's prized Cessna 180 goes up in smoke.

John Ponts fights heavy turbulence and angry passengers on a flight through the Nulato Hills. Jim and Ferno's leave the terminal in the hands of the pilots and Sarah's flight to rescue a villager lost in a storm turns into a battle for her own survival.

A group of world-renowned rock climbers arrive in Unalakleet and Jim must fly them deep into the remote Brooks Range.

Pilot Yuri Ivanoff trains in Bethel; Jim tries to do a river landing in Unalakleet.

Era Alaska ferries fire crews to combat wildfires across the state; Ariel flies solo for the first time; Ponts navigates a deadly pass on his first training flight.

Halloween in Alaska brings vicious crosswinds that wreak havoc on Era's small planes. Ariel hopes to learn the family business in Unk, but a power blackout tests her abilities when she takes over as station manager.

In a dangerous mission, pilot Doug Doherty flies along Russian airspace to transport volatile explosives to the island of St Lawrence. In Unk, Ben slams into a large bird mid-flight.

A dangerous frozen river landing leaves Jim and Ferno skating on thin ice, while Ariel's flying lessons end in disaster. The biggest snowstorm of the season hits, shutting down all of Western Alaska and leaving several Era pilots up in the air.

Ariel looks for seagull eggs; Erik has a rough flight over a notorious runaway; Sarah takes her first flight in a 208.

Two pilots attempt to deliver a specialty drill through a sea of fog. Luke brings the first ever ATM to Wainwright, along with a planeload of cash. Erik races to deliver passengers and critical supplies before a spring storm shuts him down.

Villagers in Wainright lose their water supply due to the Arctic cold. Solar flares leave Ponts and Ben in harm's way. In Unalakleet, a criminal is on the loose and the Tweto's are on edge.

In the skies above western Alaska, Ariel disappears from radio contact, putting emergency services on high alert. Over the remote village of Hooper Bay, pilot Erik Snuggerud battles to touch down on a dangerously narrow runway.

In Bethel, pilot Erik Snuggerud is plagued by mechanical issues. On Alaska's North Slope, pilots Doug Stewart and John Rende battle to keep their plane from careening off an icy runway. In Unalakleet, Ariel receives a surprise visitor.

A canine delivery to Iditarod champion Lance Mackey in Fairbanks.

In the frigid Alaskan town of Unalakleet, the Tweto's and their family-run airline Era Alaska Aviation battle the arctic elements to transport supplies and passengers to some of the most non-accessible spots in North America.

The approaching winter darkness fuels a mass exodus from Unalakleet. In Barrow, a bootlegger attempts to smuggle in illegal liquor and Luke races to complete a daring rescue before the sun sets for two months straight.