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[Music]

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>>NASA started investigating alternative fuels
as a way of reducing the carbon emissions

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from aircraft.

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>>We are studying the impact of alternative
fuel on the exhaust when jet engines burn

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biofuel, but also on the properties of the
contrails when biofuel is used.

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>>We're using the German Aerospace A320 to
burn alternative fuels, and the NASA DC-8

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to chase the A320 to measure the properties
of its exhaust and the contrails.

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[Music] [Airplane taking off]

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The German Aerospace has great expertise in
atmospheric modeling and measurements.

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They have instruments that we don't have,
and we have instruments that they don't have.

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We're able to combine all our instruments
on one aircraft and do this very extensive

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investigation that neither of the agencies
could perform on their own.

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>>We do lab experiments, we do flight experiments,
we are also performing model studies to investigate

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if a fraction of the global fleet of aviation
would burn biofuel, how the environmental