PARIS—Airbus kept its crown as the world’s largest commercial airplane supplier for the third year running as it outstripped Boeing by delivering 611 jets in 2021, company data showed on Monday. The delivery numbers gave Airbus an unassailable lead on revenue-generating deliveries—the industry’s main yardstick—after Boeing only handed over 302 jets in the first 11 months. The European planemaker also sold 771 airplanes during the year, giving a net sales total of 507 after adjusting for cancelations, though it was not yet clear whether that would be enough to pip its U.S. rival. Reuters reported last week that Airbus had beaten its target of 600 deliveries in 2021 and would come in with a total of at least 605 and up to 611, depending on an internal audit. The order race remains harder to call and depends on the definition used to track Boeing net orders in data to be …