Recently, United airlines are experimenting using food waste to fuel their air planes. "Surprising you might say".

So “Oh you wasters of food, please stop throwing foods in the bin”. Rather pile the left overs and possibly make money out from then. How? I can hear someone asking. Lol… Well see how you it's used for fuel and how you can make money off it. Walaa.. you’re rich! http://foodiciary.com/2015/07/airlines-to-use-food-waste-to-produce-fuel-see-how/