European airlines are becoming increasingly confident the continent would avoid a jet fuel shortage this summer as refiners maximize jet fuel output and buyers diversify imports to offset supply losses from the Middle East with increased shipments from the U.S. and Nigeria. A month into the Iran war and the Strait of Hormuz crisis, airlines, officials, and analysts started warning that Europe had mere weeks of jet fuel supply and an inevitable crunch would arrive in the middle of May, or by the end of May at the latest.