RR are developing a 300 MPH electric plane:
https://www.rolls-royce.com/media/press-releases/2019/19-12-2019-rr-unveils-all-electric-plane-targeting-the-record-books.aspx
If one subscribes to Albert Einstein's first law of thermodynamics, the Law of Conservation of Energy, energy can neither be created nor destroyed, energy can only be transformed from one form to another. Thus to be anywhere near carbon neutral this plane and your Toyota Prius or Tesla Model 3 must always be charged from a zero emission power sources, which is near impossible.
I suspect the cost of this aircraft, if it ever goes into mass production, would even make a major airline CEO's eyes weep!