In South Korea, Cory and Justin meet the ship delivering Buffalo's water bomber plane to new buyers there. But the boys are frustrated by the buyers' poor planning. Tempers flare when they try to get the plane off the ship and delivered to its final destination. After taking part in a military paratrooper jump, Mikey brings in fashion model Kate Eaton to join his team for the Frostbite 45 snowshoe marathon.

Joe performs stunt landings for a film crew; new employee Ryan tries to prove his worth in Hay River; a dental hygienist gets thrown into the hot seat.

Canadian Prime Minister Stephen Harper visits Buffalo Airways; Joe clashes with inspectors; the Electra crew flies to Sachs Harbour for a meaty assignment.

Weighed down by the responsibility of training a new rampie, and struggling to get out of Joe's doghouse, DC3 co-pilot Tyler gets a once in a lifetime opportunity to stunt fly in his Cessna 180 for a visiting film crew. Meanwhile another Buffalo co-pilot, Andrew, is up for a job with Cathay Pacific Airlines. The last time a pilot left, Joe took it personally.

After taking command of an intense airlift, and dealing with the ugliest Electra load he's ever seen, Scott takes a scary fall on the icy tarmac. City girl Christine moves to Yellowknife to give the unglamorous rampie life a shot, firebrand mechanic Chuck returns to the Buffalo hangar and immediately stirs the pot, while Joe helps out an old friend, "Ice Road Trucker" Alex Debogorski.

A week before Christmas, Buffalo agrees to lend a hand to an RCMP initiative to fly toys to isolated communities in the north. But a series of problems with the Electra leave the company in a jam. An excess of holiday freight overwhelms cargo manager Kelly, and despite a visit from her buddy Arnie Schreder, recovering from his cancer treatment, her stress peaks after a clash with Joe.

Just months from retiring, Electra captain Ray Weber leads his crew on a multi trip mission that requires landing on a rough ice strip on a remote lake. The ice strip landing goes fine, but when the plane takes off from the strip, the right landing gear gets stuck in the wheel well. Ray and his crew try to get the wheel down but to no avail, and are forced to perform an emergency landing that they'll never forget.

When South Korean buyers come to Buffalo to look at a water bomber, the pressure is on mechanic Cory to get the plane ready. But a landing gear emergency puts him and chief pilot Justin in serious danger. Rod and Mikey salivate over a fleet of P3 Orion water bombers up for auction at a California fire fighting conference.

Buffalo has to get a CL-215 water bomber to buyers in Korea. So Justin and Cory fly the plane to Vancouver Harbour, where it will be hoisted onto a cargo ship sailing across the Pacific Ocean to its destination – a method of delivery no one has ever tried. Flight attendant David is fast-tracked to a seat next to Joe on the DC3 sked. But Joe's been on the warpath, and is known for being hard on rookie copilots.

As spring arrives and Ray's retirement day approaches, Sean surprises everyone by leaving Buffalo for a job with the competition. So Buffalo brings in Electra pilot Brian Harrison to finish the contract. But as ice strip conditions deteriorate, each flight is riskier than the last. When Buffalo gets the news of former chief pilot Arnie Schreder's passing, Justin flies a DC3 to pick up Arnie's family in Kelowna and brings them back to Yellowknife for a special memorial remembering the aviation legend.

Greenland's Narsarsuaq airport – known as one the world's most dangerous approaches – looms on the horizon as Cory and Justin begin a trans-global journey to deliver two CL-215 water bombers to Turkey. Christine pushes to become a DC3 co-pilot, but Joe throws a wrench into her plan. Mikey travels to Denmark, for the new Polarland attraction at the Legoland theme park, featuring exhibits inspired by Buffalo Airways, including Lego versions of Joe and Mikey.

Joe and Mikey hire a helicopter for a salvage mission to retrieve the rare tailpiece from a Lockheed 10A that crashed in the Yellowknife woods forty years ago. It's a personal quest for Joe; he flew that plane at the beginning of his career. Justin and Cory battle severe icing that threatens to send them plummeting into the frigid North Atlantic on the longest ocean leg of their CL-215 water bomber journey to Turkey.

Justin and Cory are stranded in Croatia while trying to complete the delivery of two CL-215 water bombers to Turkey. Metal rock band Iron Maiden's lead singer Bruce Dickinson flies Buffalo's DC3 from Edmonton to Yellowknife – then tries his hand at the four engine DC4. Mikey goes on a fitness blitz to meet the weight requirement to fly in an CF-18 fighter jet during the Yellowknife Airshow.