The Boeing logo is seen at their headquarters in ChicagoBy using Tim Hepher PARIS (Reuters) – After focusing for years on jetliners that would fly ever additional, the sector's leading planemakers are turning to shorter range plane that enchantment to airlines reluctant to pay for efficiency they don't want. Boeing and Airbus have spent billions of bucks building developed jets capable of flying a third of the way round the arena non-cease, but financial trade has pressured a new adjustment in strategy. …