An intense winter storm is slated to hit Quebec and Ontario this week, and Canadian airlines are bracing for impact. Air Canada, Porter, Sunwing and WestJet have posted travel alerts in preparation for the inclement weather. Canadians with flights departing from Montreal, Ottawa and Toronto between February 22 and 24 are especially advised to check with their carrier before heading to the airport, as some airlines are anticipating cancellations and offering easier rebooking options. Here's how each major airline is reacting to the storm.