Every time I flew ANC to SFO last year First Class was the cheapest fare available on Virgin. I repeatedly called reservations in disbelief....and they assured me it happens on occasion, and to enjoy the upgraded seat...

First cheaper than coach or coach premium, when all classes were available. Blew my mind. Still does.

I flew First several times on that 5 hour flight for under $400! (While folks sitting in coach had paid the same fare or even more.)