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"It's a lot better than a regular jet," Mr. Felder said.
The hypersonic plane would take off using a regular jet engine, before rocket boosters kick in to start a sharp ascent, sending the plane soaring above the atmosphere.
The unmanned drones used by the US Navy to bomb its enemies without risking its pilots have been tested using a 50-50 mix of biofuel and regular jet fuel.
One Chicago company, Indigo Business Air Service, started regular jet charter service between Midway Airport in Chicago and Teterboro Airport in February, plans to start a Westchester-Midway shuttle by November and is considering a link to MacArthur Airport next year.
In 2008, Virgin Atlantic was the first to fly a plane on a blend of biofuel and regular jet fuel.
That's because biofuels made from recycled cooking oil are expensive – about $10 per gallon, or roughly three times the price of regular jet fuel – largely due to the costs of refining and preparing the oil for use on jumbo jets.
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This reduces the temperature buildup in the combustion chamber, overcoming the limits of regular jets but requires a rapid and tricky mixing and burning of fuel and air.
To gain a few hours over regular jets, you had to travel on a plane that was swiftly becoming a museum piece of aeronautics.
While the design and materials used to make regular jets limit the speed of aircraft to three or four times the speed of sound (2,000 to 3,000 m.p.h)., scramjets theoretically may push planes to speeds of 18,000 m.p.h.
The Comet 4 enabled BOAC to inaugurate the first regular jet-powered transatlantic services on 4 October 1958 between London and New York (albeit still requiring a fuel stop at Gander International Airport, Newfoundland, on westward North Atlantic crossings).
How does he pay for his regular private jet flights?
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