Q-400 DHC-8 San Diego State UniversityQ 400 Alaska Air model aircraft. The Q400 is a twin engine turboprop aircraft manufactured by the Canadian company Bombardier. The "Q" in the name stands for "quiet", because the noise and vibration suppression system (NVS) prevent a large proportion interior and exterior noise, making the aircraft one of the quietest in its class. This aircraft type is also environmentally friendly because of its fuel economy and much lower CO2 emissions than