Rarely in aerospace do the hopes of a company pivot almost entirely on the successful outcome of a single technology, but this is the gamble Pratt & Whitney faces as it embarks on flight tests of its second geared turbofan model and takes another key step toward revitalizing its civil engine fortunes. At stake, effectively, is the future of the company's large-commercial-engine business and with it the prospects for a doubling of revenues to roughly $24 billion per year by the end ...


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