Two new airliner power-plants are offering an unprecedented choice: With engine bleed air to power aircraft systems, or without. It's a package deal, of course; in order to get the bleedless powerplant one must order the 787, while the A350 only comes with bleed air. Rolls-Royce and GE are girding their corporate loins for battle because the potential stakes already are huge, with many sales campaigns well advanced around the world. Both can point to early victories. Rolls has scored the ...

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