It is not as if ultra-long-haul flights have not been tried before. Singapore Airlines worked long and hard to implement its very, very long flight from Singapore to New York. It ultimately failed because it was impossible to make money on such a marginal operation using a four-engine Airbus A340-500 with fuel prices on the rise. But now two fundamentals have shifted dramatically, and that has many more airlines revisiting the idea. Fuel prices are back about where they were when the first ...

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