Originally Posted by
ACYYZ/SD
Not sure who matched whom, but AC is offering $57.00 each way.
It's past 4pm ET, so a moot point, but it should be noted that the AC $57 each way would be ++ for a total round trip of about $210. This promo fare with US was $129 round-trip, including taxes, making it a bit better than published fares in the market.
Thanks to
dc2005b for pointing it out... I was able to grab one!