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Frontier Airlines is discontinuing its Denver-Calgary route, saying the route doesn’t have a built-in seasonal audience as Vancouver, British Columbia, does for the cruise industry, and business traffic didn’t materialize as it had hoped.
Frontier is also planning to cancel routes to Cancún from Indianapolis; Nashville, Tenn.; Milwaukee; and St. Louis, as well as routes from Dallas-Fort Worth to Mazatlán and Kansas City to Cabo San Lucas.



