The de Havilland Canada DHC-6 Twin Otter is a rugged, twin-engine turboprop utility aircraft famous for its exceptional Short Takeoff and Landing (STOL) capabilities, making it ideal for remote regions and harsh conditions, serving as a commuter airliner (18-20 seats), cargo, and special mission aircraft, with modern Series 400/300-G versions featuring updated avionics like Garmin G1000NXi and flexible interiors, continuing production under De Havilland Canada after Viking Air restarted it. The Pratt & Whitney Canada PT6A is a highly popular and versatile family of gas turbine turboprop engines, known for their reliability and distinctive reverse-flow design, powering diverse aircraft from 500 to over 1,900 shaft horsepower (shp). Key features include a two-shaft free-turbine setup, modular construction for easy maintenance, and a planetary gearbox, making them ideal for general aviation, commuters, and utility aircraft, with over 50,000 produced since 1964.