In jet aircraft, purifying cabin air would save on fuel needed to compress fresh air bled from the engine to ventilate the cabin.

FORBES: Companies & Strategies

This blend produced by SkyNRG has been recertified to normal jet fuel standards and can be safely used without modifying the aircraft's systems.

ENGADGET: Air Canada embarks on its first biofuel-powered flight from Toronto to Mexico City

The main reason for these projects is not to develop primary power sources for jet-turbine powered aircraft, but to build small, highly efficient fuel cells that could be used to make greener airliners.

ECONOMIST: Electric planes

The company has shipped its jet fuel to the Air Force, which has tested it in A-10 aircraft.

FORBES: Biofuels Startup Gevo Must Win Patent War With BP, DuPont First

Three are corporations with jet aircraft fleets that use the Mustang for trips under 1, 000 miles to average down fuel and maintenance costs.

FORBES: Cessna's Mustang Refutes The Decline Of Capitalism

The aircraft experienced a "catastrophic mechanical malfunction" during takeoff from Naval Air Station Oceana on Friday, raining jet fuel over Virginia Beach before plunging to the ground, according to residents and Navy officials.

CNN: 'Oh my God!' Callers recount Navy jet crash