As airlines pressure aircraft makers Boeing and Airbus to deliver more fuel-efficient jets, Boeing noted on Sunday that the more efficient engines on existing narrow-body models would increase weight and the fees that airlines have to pay at airports. "It's a very complex algorithm, it really is, and there's a lot of factors that have to be considered," said Boeing Commercial Airplanes CEO James Albaugh. "We're not trying to rush into this thing. Whether it's a re-engine or a new single- aisle plane, it's the customer who'll drive us to do the right airplane."
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