CALGARY—Canadian air travelers are experiencing an uptick in flight cancellations this holiday season, but airlines say weather is a bigger factor than COVID-19. According to airline data company Cirium, Canada’s largest airlines canceled hundreds of flights between Dec. 22 and Dec. 26 of this year. Flair Airlines canceled nine percent of its scheduled flights during the period while WestJet Airlines Ltd. canceled seven percent of its flights. Air Canada canceled four percent of its scheduled flights during the period. The proportion of canceled flights was significantly higher than earlier in December, when the cancellation rate for major carriers hovered around one to two percent, and also higher than the same period during 2019’s pre-pandemic holiday season. South of the border, U.S. airlines have reported canceling significant numbers of flights in the past week because of staff shortages tied to the Omicron variant. Both Delta Air Lines and United Airlines said …