The CC-138 Twin Otter is used in transport and support roles in northern operations as well as search and rescue missions. It is highly adaptable and well suited to Canada’s ever-changing northern climate and terrain.

The Twin Otter is a short take-off and landing utility-transport aircraft. It can be outfitted with wheels or skis for landing on ground, snow and ice.

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440 Transport Squadron

440 Squadron's tasks include airlift, utility and liaison flights in support of Canadian Armed Forces in the north, including support to the Canadian Rangers. Like all Royal Canadian Air Force flying squadrons, 440 Squadron can conduct search and rescue missions when requested by Joint Rescue Coordination Centres. They also conduct free fall live parachute operations, cargo delivery to troops in the field, and fishery patrols on Great Slave Lake. 440 Squadron operates four of the famous Canadian-designed and produced CC-138 Twin Otters to carry out its wide range of tasks. The Squadron operates these rugged aircraft in some of the harshest weather conditions on the planet and is the only formed RCAF unit that is based full-time in the north.

The Squadron is comprised of approximately 55 members who are a mixture of Regular Force and Reserve Force members. In addition to conventional airport operations, the Squadron maintains the capability to conduct "off-airport" operations on skis in the winter and on tundra tires in the summer.