The Globe and Mail reports in its Friday edition that Canadians travelling to Europe and parts of Asia may face flight disruptions and cancellations within weeks as the conflict in the Middle East strains already dwindling global jet-fuel supply. The Globe's Mariya Postelnyak writes however, that aviation experts warn against passengers cancelling flights prematurely, absolving carriers of their obligations to rebook or refund passengers, while advising those who haven't yet booked to lock in prices with refundable tickets. Germany's Lufthansa airlines announced it is shutting down its CityLine subsidiary, grounding as many as 27 planes. Ryanair said the carrier can only guarantee its fuel shipments until mid-May, while Virgin Atlantic chief executive Corneel Kosterhas announced last week that the airline has about six weeks of secure jet-fuel supply. Domestic flights in Canada and North America are expected to remain relatively stable. However, the cascading effects of global travel disruptions may affect demand. If an airline cancels a passenger's flight because of fuel shortages, the carrier must still offer the choice to either a refund or rebooking on the next available flight, including with a competitor.