Aviation 's future must be efficient , greener and easier as air travel grows . Just 1 % greater fuel efficiency means millions in savings for airlines . Aircraft with roof - top windows are part of the Airbus family .
Aviation 's future must be efficient , greener and easier as air traffic grows . Just 1 % greater fuel efficiency means millions in savings for airlines . Cabins with glass-top ceilings are part of the Airbus vision .