BOEING AND AIRBUS APPEAR far away from launching a successor to the 737 and A320 families but engine manufacturers already are well into development of advanced-technology powerplants that could make the next generation of workhorse narrowbodies much more efficient and environmentally friendly than their predecessors. CFM International spent the summer testing its first LEAP-X engine core at a GE Aviation testbed in Evendale, Ohio, (see photo, left) while also conducting crosswind tests ...

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