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

One of the aircraft's two batteries was replaced in October after it failed to start the jet's engines, the battery's primary function.

WSJ: FAA Grounds U.S. Boeing 787 Dreamliner Flights

The evolution of executive grandeur from very comfortable to jet-setting reflects one of the primary reasons that the gap between those with the highest incomes and everyone else is widening.

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