PARIS (Reuters) -Airbus is delaying development of its A321XLR jet by several months, pushing its arrival to 2024, as regulators tighten the rules to prevent fire risks, industry sources said. The latest upgrade to the best-selling A321 had been due to enter service in late 2023, but the delay stems from discussions with regulators about certification of a novel fuel tank needed to boost its range in a battle for sales with Boeing. The European Union Aviation Safety Agency (EASA) is lookin

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