The Globe and Mail reports in its Monday edition that United Airlines has approached Airbus SE about buying more A321neo jets to fill a potential void left by the delayed Boeing 737 Max 10. A Reuters dispatch to The Globe says that United chief executive officer Scott Kirby flew to Toulouse recently to sound out the plane maker on a potential quid-quo-pro deal after an inflight emergency on an Alaska Airlines 737 Max 9 raised new doubts over certification of the already delayed Max 10. Talks are at an early stage and there is no guarantee of a deal. Mr. Kirby's previously unreported trip to Toulouse is the latest twist in a widening crisis engulfing Boeing as the plane maker seeks to reassure the public and regulators about production quality and safety while preventing key orders from unravelling. Mr. Kirby last week called the Max 9's partial grounding "the straw that broke the camel's back" following certification delays to the Max 10, the largest member of a jet family tarnished by an earlier safety crisis caused by two fatal crashes. United has not cancelled any of the 277 Max 10 jets it has on order, but it has removed them from internal plans. Reuters says the A321neo is the most in-demand jet in its category.