Global airline chiefs open their annual summit in Rio de Janeiro on Saturday facing a sharper test of the industry’s post-pandemic recovery, as the Iran war drives up fuel costs and disrupts airspace while carriers try to cushion the blow with higher fares and tighter capacity. The annual meeting of the International Air Transport Association (IATA) from Saturday to Monday comes as that fuel shock collides with another problem airlines cannot quickly fix: a shortage of new aircraft. Boeing and...