FlyI has filed for Ch. 11 bankruptcy. I hope DH stays around as long as possible. I like the low fares it encourages UA to offer out of IAD.
Perhaps UA has wisened up however, as I have noticed recently that it has become harder and harder to find ultra-cheap BOS-IAD fares on UA.
http://www.flyertalk.com/forum/showthread.php?t=490596