WestJet flight attendants’ union says it has issued a 72-hour strike notice to the airline, setting up the possibility of job action during the summer travel season. The notice comes amid ongoing contract negotiations, with the union representing about 4,400 flight attendants. Multiple outlets report that, if a tentative agreement is not reached within the notice period, some flights could begin to be grounded by Friday. The 72-hour notice is treated as a formal step that can precede a strike, although no strike action is confirmed in the reports. The timing is particularly significant because it falls during a busy period for air travel, raising the prospect of disruptions should negotiations fail to result in a deal. The union and WestJet have not been described in the provided accounts as reaching an agreement, and the outcome depends on whether talks conclude successfully before the notice expires.