Takeoff, and landing abort. It might turn out to be economical to have hybrid engines that are fully optimized (in efficiency and in drag) for sustained climb l

Takeoff, and landing abort. It might turn out to be economical to have hybrid engines that are fully optimized (in efficiency and in drag) for sustained climb load (or even just to cruise) that can only deliver takeoff/abort thrust using electrical assist. It could be enough to carry batteries for no more than a few minutes of assist! I don't know though how much the efficiency of current jet engine drops off at the far ends of their throttle range.