Regarding hydrogen-fueled passenger aircraft, there are two major concerns facing the airline industry: growing amounts of CO_2 emissions to the upper atmosphere and continuously increasing jet fuel prices as petroleum sources are being depleted fast. Both of these problems could permanently be resolved by converting to hydrogen. Hydrogen, the fuel of space travel and three times lighter than jet fuel, will save substantial weight, fuel consumption will greatly decrease, engines will be smaller, noise will be less, and there will be no CO_2 emissions. Hydrogen will never be depleted, so long as we have the Sun. It will be a bonus for supersonic and hypersonic flights, since it burns much faster than jet fuel, and will help cool the surfaces heated by frictional heating.
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