The union representing nearly 4,400 flight attendants at WestJet has issued a 72-hour strike notice to the airline, prompting the carrier to respond with a lockout notice. The move brings the two sides closer to a potential work stoppage that could disrupt flights for passengers. The union, which represents the majority of WestJet's flight attendants, served the strike notice as contract negotiations continue. WestJet then issued a lockout notice, indicating the airline would not allow the attendants to work if a strike occurs. The 72-hour notice means the union could legally walk off the job at the expiration of the period, while the lockout gives WestJet the ability to prevent employees from working. No further details on the status of negotiations were immediately available. The two sides have been in talks for a new collective agreement, with issues including wages, scheduling, and working conditions. A strike or lockout would affect WestJet's operations across Canada, potentially leading to flight cancellations and delays. The airline has not yet announced contingency plans. The union has said it remains committed to reaching a deal but is prepared to take action if necessary. WestJet has expressed hope that a strike can be avoided through continued bargaining.