For passengers, little will be different - the engines will still roar, the seats in economy will still be cramped - but for the airlines and the biofuels industry, the flight will represent a long-awaited milestone: the first time a domestic airline operates regular passenger flights using an alternative jet fuel.

For years, biofuels have been seen as an important part of the solution to reducing greenhouse gas emissions. And airlines, with their concentration around airports and use of the same kind of fuel, have been seen as a promising customer in a biofuels industry that has struggled to gain traction.

Now that relationship is showing signs of taking off.

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