Commercial airlines are using an increasing number of narrow-body aircraft and smaller regional jets.

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The narrow-body aircraft segment is shaping up to be the next important battle ground for global aircraft manufacturers.

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The C919 is China's answer to the Airbus A320 and Boeing 737 -- a single-aisle, 168-seat, narrow-body commercial liner produced by Chinese state-run aircraft manufacturer Comac (Commercial Aircraft Corporation of China).

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