Thousands of Canadians hoping to escape the relentless snow and cold at home have had their vacation dreams dashed after Sunwing cancelled all southbound flights out of two of the country's busiest airports this week.

In a statement posted to its website Thursday, the airline said it made the "necessary decision" to cancel all southbound flights out of Toronto Pearson International Airport on Wednesday and Thursday, and all southbound flights departing from Montréal-Pierre Elliott Trudeau Intern…