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The single-aisle medium-haul A320 series of aircraft remained its most popular, with 88 orders, including 33 for the A320neo which Airbus plans to begin delivering in 2015 with newer fuel-efficient engines. Its rival Boeing registered 148 orders and two cancellations in January, and delivered 38 aircraft, according to its website. Airbus strongly outperformed Boeing in 2011, winning a record 1,419 orders while its US rival won 805, boosted by strong demand for the A320neo which should offer airlines 15 percent fuel savings.