First all-electric airline could soar with converted old seaplanes

Harbour Air De Havilland DHC-2 Mk III Beaver flying out of Vancouver, B.C. (Credit: Harbour Air)By land, by sea, and by air, battery power is expanding to drive all kinds of transportation. The most challenging of these modes may be air travel. It’s harder to loft several thousand pounds of batteries into the air, to make them last potentially an hour or more. And if they run out of juice, pilots can’t just pull over and call for a tow…