Airlines worldwide are dealing with a worsening disruption linked to jet fuel supply constraints, described by outlets as the most significant crisis since the COVID-19 pandemic. One report states that more than 13,000 flights are already cancelled in May, reflecting an increase in cancellations tied to the jet fuel supply crunch. The coverage frames the issue as affecting flight availability during the summer travel period, with airlines operating under fuel-related limitations that contribute to schedule changes and cancellations. A poll mentioned in the reporting asks whether the jet fuel crisis is putting travelers off flying this summer, indicating that the disruption is also shaping consumer sentiment. The articles do not provide detailed breakdowns by country, carrier, or route, nor do they specify the underlying causes of the fuel supply problem. Overall, the reported common thread is that jet fuel supply issues are driving widespread cancellations, with the reported scale of cancellations in May used as a marker of the severity of the disruption.