I’m in Vancouver for about half the year. Been following this story for a while. Unfortunately I don’t share the same enthusiasm for the project as the manufacturers do. Charging time, the need for many, many identical proprietary battery designs and charging stations at numerous airports, the logistics of change a 1 ton battery between flights and a whole host of other issues makes this a huge undertaking. Battery technology is still not there. Tesla has taken the technology about as far as you can and they are years and years away from any new implementation. While I would love to see it happen, the engine is probably the best thing that comes from this but, until they improve battery tech it’s going to be some time before any commercial service begins, if at all.