Huge ad in the calgary sun today, "First US low cost airline now flies to Canada". Looks like Frontier Airlines is branching into Calgary, random search of 4 different round trips from YYC to Las Vegas return in June on both Frontiers website and Westjets website, and Frontier beat them everytime. (unforntunately AC beat Frontier 3 times out of 4 on the same dates).

Thoughts on what Frontier will do to WJA plans in the US?