Swoop, WestJet's ultra-low-cost carrier, is hoping to capitalize on U.S.-Canada border restrictions by offering passengers discounted domestic travel.

WestJet said it is indefinitely suspending flights to Moncton, Fredericton, Sydney and Charlottetown, while 'significantly' reducing service to Halifax and St. John's. 

Dec. 27 will be the busiest day during the holiday season, with over 50,000 people expected to be coming and going, the airport authority said.