Then you have two different energy storage areas plus two different drive trains, and the associated weight gain that implies. Hybrid road vehicles make it work

Then you have two different energy storage areas plus two different drive trains, and the associated weight gain that implies. Hybrid road vehicles make it work because they have the weight supported by the ground, plus the additional benefit of regenerative braking, which evens out energy usage in stop-and-go and hilly travel. Planes don’t work at all in either scenario.