I posted this earlier in the week on the mileagerun forum (where, surprise, there's little interest in WN ), but I thought it would be worth mentioning here as well.

WN is matching USA3000's $49 ow fares from PHL to FLL, TPA and RSW. Availability seems to run to early February, but there's good availability in January. In the past, I've occasionally seen lower Ding fares in these markets, but given WN's flexible ticket rules, the bird-in-hand principle makes these quite attractive for winter.

I'm surprised WN is doing this, but I guess I shouldn't be. They don't like to be undersold, even when it's by very small airlines.