Boeing / AA puff Piece on "Green" technology.

[v8Statesman]

Interesting read though

The airplane (738) will feature adaptable trailing edge technology to cut down on noise and emissions during the entire flight. Its variable area fan nozzle will reduce community noise, while flight trajectory optimization allows crews to determine more fuel-efficient routes. The airplane will also feature regenerative fuel cells for onboard power to potentially reduce weight, fuel burn and CO2 emissions.​

Green-Eyed Lady