Biofuel saw another first on Monday as United Airlines made the first passenger jet flight in the United States using a blend of petroleum and fuel made from algal oil. But how does the airline industry feel about getting a government push to go green?

Amid plenty of celebration over biofuel demonstrations – which have been seen in China and on a flight from New Jersey to Paris, among many others – it remains to be seen whether it will become an integral part of aviation. And while all of those demos are taking place, United is among the many large carriers from dozens of countries around the world locked in a battle with the European Union over greenhouse gas