B2 and how that aircraft also used generated electricity to improve it's efficiency, by reducing drag about 60%
That'll be the ion drive where they can shut down the jets and fly unrefuelled for ever. You can tell when the ion drive is being used because a white plasma cloud forms on top of the wing. So the internet tells us, must be true. The internet tells me the moon is made of blue cheese and the world is flat, though some believe it's spherical and hollow.
https://en.wikipedia.org/wiki/Plasma_stealth