BOSTON—Airbus is sticking to its quest for record jet output after airlines reported glimmers of a post-pandemic recovery this week, and believes engine makers who have questioned its most ambitious proposals will be “unable to resist” demand. Airbus has said it hopes to almost double jet production in a few years as borders reopen. Engine makers fear doing so too quickly could upset their own recovery, by forcing existing jets into retirement rather than their repair shops. Interviewed at the airline industry’s main annual event, Airbus Chief Commercial Officer Christian Scherer held out the prospect that Airbus would play on fierce competition between engine makers as it aims to secure future output of its A320neo. “There will be engines. That is the beauty of having engine competition in the program,” he told Reuters on the sidelines of a meeting of the International Air Transport Association, the first such industry gathering …