Great Electric Airplane Race

S48, E7: Electric cars seem increasingly likely to replace our gas-guzzling vehicles. Could a new generation of emission-free electric planes do the same to the polluting airliners in our skies--a major step in the fight against climate change? NOVA looks at an array of new electric planes and takes a ride in some prototypes. Will the dream of super-quiet, super-efficient airliners become a reality?