The majority of air passed through modern jets is bypass air. I don't think the availability of oxygen is the clincher. Things like refueling speed, the weigh

The majority of air passed through modern jets is bypass air. I don't think the availability of oxygen is the clincher. Things like refueling speed, the weight of the batteries themselves (which don't burn up as you consume them like combustibles, and the overall better energy density of combustibles probably make the whole thing more attractive at today's tech.