Another factor which could be looked at is the recharging vs usage capability of a battery.
Considering that long distance jets fly in the jetstream, we might be able to use the air flow to generate quite a bit of energy. It only has to be above the losses due to the additional drag, and we might be able to go with lesser fuel than required.
Or, in the future, fly through thunderstorms, somehow able to tap into electrically charged clouds and recharge the batteries straight away (using a thunderbolt connector, maybe
Another possibility is that of mid-air recharge. Not attempted in civilian due to the inherent dangers associated with jet fuel, in this case, it is nothing but a long trailing cable which can hook to recharging connectors. The dangers after far less than what one would have from jet fuel transfer.
The point is, there might be many other avenues open too when we move towards electricity. The future seems bright.