The EcoJet is a proposed short-haul aircraft for 100 to 200 passengers using propfan engines. The aim of the EcoJet is to stimulate aircraft manufacturers to build a passenger aircraft that would be more environmentally friendly than current generation jets (like the Boeing 737 and the Airbus A320 family), because the intended design using would reduce carbon dioxide emissions by 50%, nitrogen oxide emissions by 75%, and noise pollution by 25% versus current Boeing 737 standards.