From an AC comunique. However, in the event a strike cannot be averted before CUPE's deadline, the airline is proceeding to prepare for the implementation of a partial schedule, if required, for Wednesday September 21 in order to ensure orderly schedule modifications as necessary. Effective immediately, temporary modifications are being made to some regularly scheduled Air Canada Express flights operated by Jazz on September 21 in order to redeploy the limited number of aircraft available to serve the greatest number of passengers on Air Canada's highest demand domestic and transborder routes. Air Canada Express customers booked for travel Wednesday September 21 who are affected by schedule changes are being notified directly by Air Canada or their travel agent. Customers who booked directly through Air Canada will receive an email or SMS notification if a change has been made to their itinerary inviting them to use Air Canada's online rebooking tool for Delayed and Cancelled Flights at aircanada.com in order to make alternate arrangements. Customers with cancelled flights also have the option of requesting a full refund through the online rebooking tool.