A dangerous nighttime chase has team Dominator on a collision course with a tornado they can’t see. While team TWISTEX battles mechanical issues, the TIV team is becoming their own worst enemy.

In the worst tornado outbreak in over half a century, Mississippi & Alabama are ravaged by hundreds of twisters. Towns are wiped clean off the map, and hundreds of people lose their lives.

After a tragic tornado outbreak in Alabama and Mississippi, all teams help with the recovery effort. Back on the chase, team TIV is determined to warn people, team TWISTEX is hoping to use their new radar.

Team Dominator takes the day off, but when Team TIV scores a victory in Reed’s own backyard, Reed vows to chase with a vengeance. Meanwhile, tensions within Team Twistex continue to rise as Tim grows more cautious while chasing storms in Kansas.

A tornado outbreak threatens to wreak havoc in team Dominator’s backyard. The TIV team follows their navigator’s bold prediction, with the success of their mission hanging in the balance. Tension threatens to derail team TWISTEX’s chase on a huge

Team Dominator risks everything to warn people in the path of a violent storm, but internal strife threatens to end their season early. Still gun shy after witnessing devastation this season, Sean Casey is trying TIV team’s patience.

It’s the last chase of the season, and Mother Nature is going out with a bang. Team Dominator is chasing a monster tornado for a radar intercept. Team TWISTEX has one last chance to deploy their probe in its path.

In the frigid Alaskan town of Unalakleet, the Tweto's and their family-run airline battle the arctic elements to transport supplies and passengers to some of the most inaccessible areas on the planet.

Pilot Luke Hickerson transports dangerous chemicals from Barrow to the remote village of Atqasuk. Then, in Unalakleet, the cold and dark winter claims its first casualty and Jim must make arrangements to transport the casket.

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.

Unseasonably warm weather sends Jim up to the Brooks Range to look for potential landing strips. Ferno and Ariel prepare an Eskimo feast for returning pilot John Ponts and the week ends with an icy plunge into the Unalakleet River.

In Bethel, construction crews race to finish Era's newest hanger before the unforgiving winter snows arrive. But when Jim flies in to inspect the progress, he is far from happy. In Unk, fierce crosswinds blow John Ponts' tiny 207 all over the sky.

Pilot Yuri Ivanoff trains in Bethel for a potential promotion to fly the 208 Caravan. But danger strikes when heavy ice forms on the wings. In Unalakleet, weeks of rain force Jim to do a river landing and a greenhorn arrives.

Era Alaska makes a special canine delivery to four-time Iditarod champion Lance Mackey in Fairbanks. After the first snow in Unalakleet, Jim and Ferno cope with an influx of schoolteachers on their busiest day of the year.

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.

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.