This week, United Airlines has carried out a flight combining the use of aviation biofuel, cabin waste reduction, carbon offsetting and operational efficiencies. The “Flight for the Planet,” a Beoing 737-900ER based out of LAX, was powered by a 30/70 blend of low-carbon, sustainable aviation fuel, which achieves more than a 60% reduction in greenhouse-gas emisions on a lifecycle basis compared to traditional jet fuel. The fuel is developed by Boston-based World Energy. United recently renewed their contract with them with an agreement to purchase up to 10 million gallons, making them the only U.S. airline to use biofuel in its regular operations.