I actually didn't believe this when I first saw it, so I checked it, you're right...$64....works out to about $0.067 per mile on yield. Not sure what WN's CASMs are...but for some reason $0.08 rings a bell.
I do believe WN will actually grow during this meltdown....they are perfectly positioned and managed to do it. And the scary thing is, their product continues to improve. Their new Business Select and boarding procedure makes it unnecessary to get to the airport 2 hours early. And their "elite" customers get A boarding passes no matter when they buy or check in. AND, at 100 flights, their elits customers can bring a guest, no charge.
Frankly, if I didn't do so much long haul traveling, I'd make them my #1 carrier.