Zunum Aero, a startup backed by Boeing and JetBlue, on Wednesday announced that it was developing regional hybrid-electric aircraft with backing from Boeing’s HorizonX innovation cell and JetBlue Technology Ventures. The planes, which will have 10 to 50 seats, are scheduled for launch in the early 2020s. With its regional aircraft, Zunum aims to democratize access to fast, affordable travel over distances of 700 miles at launch, to more than 1,000 miles by 2030.