Summit Air is an aviation company based in Canada with its headquarters located in Yellowknife in the Northwest Territories. The company was founded in 1979 by John Sim and has since grown to become one of the largest and most respected charter airlines in the world. Summit Air specializes in providing air charter services to customers in the Canadian Arctic, providing access to some of the most isolated parts of the country.

The company started out with a single DHC-6 Twin Otter aircraft in 1979 and has since grown to a fleet of over 30 aircraft across Canada. The fleet consists of a mix of turboprop and jet aircraft, including the DHC-6 Twin Otter, DHC-8-300 Dash 8, ATR-42, Beechcraft King Air, and Challenger CL-604. This fleet allows Summit Air to provide services to a wide range of customers, from cargo to passenger transport in all types of weather conditions.

Over the years, Summit Air has achieved several milestones. In 1994, the company became the first Canadian carrier to be certified as a CAT III operator, enabling the company to land in low visibility conditions. Four years later, Summit Air became the first airline to use the Enhanced Ground Proximity Warning System (EGPWS), one of the most advanced aviation safety systems available. In 2003, the airline became the first Canadian operator to acquire an ATR-42 aircraft, allowing it to expand its fleet and services. In 2008, the airline achieved another major milestone with the introduction of its first jet aircraft, the Challenger CL-604.

Throughout its history, Summit Air has been involved in several incidents and investigations. In 2003, one of its flights was involved in a mid-air collision with a private aircraft that resulted in the death of the pilots of both aircraft. The Transportation Safety Board of Canada (TSB) conducted an investigation and found that the collision was caused by the pilot of the private aircraft, who failed to maintain a proper lookout. In 2008, the TSB also conducted an investigation into an incident involving a Summit Air DHC-6 aircraft that suffered an engine failure on approach to a remote airstrip in the Northwest Territories. The investigation found that the engine failure was caused by a faulty fuel injector.

Summit Air has come a long way since its founding in 1979. The airline now operates a fleet of over 30 aircraft across the country and is an integral part of the aviation industry in Canada. The company has achieved numerous milestones, such as becoming the first Canadian carrier to be certified as a CAT III operator and the first to use the EGPWS system. Despite its involvement in several incidents, the airline has worked hard to ensure safety and reliability of its services.