Home Sustainable Aviation Fuel Delta’s first carbon neutral flight powered by Air BP-supplied biofuel Delta’s first carbon neutral flight powered by Air BP-supplied biofuel 15 Jul 2019 | NewsSustainable Aviation Fuel Delta’s first carbon neutral flight powered by Air BP US airline Delta has flown its first carbon-neutral delivery flight, using biofuels and carbon offsets, as the airline continues towards its goal of a 50% carbon emission reduction by 2050.