The four-seat eFlyer 4 is the initial target for the new battery system, followed by future larger aircraft projects suitable for air taxi operations. While the eFlyer 2 is focused on the training market, with a 3-hour endurance and range enough for the cross-country flights towards the private pilot certificate, the eFlyer 4 aims at flying longer. In its current state of development, it’s projected to fly 200 to 300 nm, or for roughly 4 hours. With the Li-S technology, Bye sees a potential for a 7- or even 8-hour endurance. “If true,” says Bye, “it’s a gigantic technical advantage,” and will help the airplane reach its full market potential.