Scott faces his worst nightmare when a faltering engine and low fog force a scary landing. Mikey lands in hot water after failing to have his father's backup Douglas DC-3 ready for passengers.

Christmas is just around the corner, but Buffalo's crucial supply runs come to a halt. An engine seizure strands Scott and AJ, pushing the whole company to the breaking point.

The crew works through the night to turn a DC-4 into a flying fuel tanker, trouble between the sexes heats up, and chief pilot Arnie has the birthday flight from hell.

Justin races to deliver an emergency generator as a town in trouble waits in the cold. Joe teeters on the brink of a deal that could save Buffalo's hide.

Cory races against the clock to turn two short-haul water-bombers into transatlantic aircraft. Devan and Scott encounter the menace of wind shear, testing their friendship.

Joe loses it after an operational screw-up. Devan ponders a job offer, while Jynelle ponders their future. Justin helps a Brit and his dog start a new life in a remote northern outpost.