Arctic Air launches a search and rescue operation for Dev and Astrid.

Bobby fights against time and politics to evacuate a community before an upstream dam bursts.

Krista and Tag’s relationship is tested when an emergency landing leaves them stranded.

A high-stakes plane race raises ghosts from Mel’s past, forcing Krista and Tag to confront a crisis in their relationship.

Krista faces a grisly choice when her team attempts a life and death rescue.

Bobby and Loreen race to save Caitlin when her first solo flight goes dangerously wrong.

A prisoner transport becomes a life and death struggle for Blake and Lindsay, as Krista and Tag reach an impasse in their relationship.

Bobby and Connor’s weekend on the land becomes a fight for survival, while a high altitude flight puts Mel and Krista in peril.

Bobby blames Bruce Ward for his foster sister’s death in a dry community, as Blake and Lindsay pursue a murder suspect.

Krista’s SAR crew is pushed to the limit during a high-altitude rescue, while Bobby is the target of an attack in YK.

When disaster strikes, Krista’s SAR team is trapped, and Tag clings to life on the mountain; Bobby and Mel race to save them.