Indeed, this high Specific Energy (~2000 Wh/kg) would be enough to make electric airplanes feasible and economical. Heck, even high-altitude supersonic electri

Indeed, this high Specific Energy (~2000 Wh/kg) would be enough to make electric airplanes feasible and economical. Heck, even high-altitude supersonic electric "jets", because you don't need oxygen to run electric motors!