Rick

You continue to make the same mistake, repeatedly.

You assume that the technology will not progress beyond current limitations.

You assume that current electric storage capacities won't improve.

They will and they are, at an impressive pace.

Check back in ten years.

You also assume that future planes will require the same energy to move that a current 777 requires.

They are getting lighter with each new generation of design and materials and will require  less energy to perform the same tasks.

Your attitude would have us still riding in the horse drawn carriages that my great-grandfather was in the business of building, right up until those new-fangled "horseless carriages", that he believed were a fad, put him out of business.