USAF Thunderbirds to fly first air show with biofuel

http://www.aopa.org/aircraft/article...h_biofuel.html

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The U.S. Air Force Thunderbirds will fly their first public performance using an alternative fuel at the Joint Services Open House at Andrews Air Force Base in Maryland on May 20 through 22.

Two of the Thunderbirds’ six F-16 fighters will use biofuels during the performances while the others burn regular jet fuel.

The Air Force is testing biofuels derived from plant seed oil, animal fat, and various waste oils and grease. The Air Force has approved biofuel in a 50-percent blend with petroleum-based jet fuel in its A-10, F-15, C-17, and F-22 aircraft. All Air Force jets are expected to be certified for biofuels within two years.

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pretty cool, but i wonder why this hadn't been done sooner.