When winter claims its first casualty, Jim transports the casket. Plus, Luke feels the pressure when he has to fly dangerous chemicals to an isolated village.
As Alaska endures a brutal winter, Ariel joins in on a search for her missing friend and Sarah attempts a difficult landing to aid a stranded pilot stranded.
Alaska's harshest winter in years wreaks havoc on Era's fleet, causing Doug's brakes to freeze on an icy runway and Sarah's aircraft door to malfunction mid-flight.
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.
Doug tests his limits while landing on a melting runway, and John Kapsner tries to locate two missing snow-machiners. Meanwhile the Iditarod dog sled race starts.
On Alaska's North Slope, pilots Doug and John battle to keep their plane from careening off an icy runway. Meanwhile, in Unalakleet, Ariel receives a surprise visitor.
Ariel disappears from radio contact, putting emergency services on red alert. Over the village of Hopper Bay, pilot Erik Snuggerud battles to touch down.
Pilot Sarah battles strong headwinds while attempting to deliver fuel to the research station and Ben braves 50mph winds to retrieve a priest for Easter Service.
After 30 years of running Era Alaska, Jim sets his eyes on a new path. Doug loses all avionics while flying. Ariel takes the final steps towards getting her pilots...