To my knowledge there are two - Expedia and Travelocity, which (I believe) couldn't, or didn't want to, deal with unbundled fares.

Orbitz seems to have its act together re unbundling, it's almost as if the new "Economy" fare was designed with them in mind.

As to future routes, NYC or New England, I am find it increasingly difficult to imagine what Frontier would do. I've known about IAD for a week or two, but it took me by considerable surprise when I first heard about it and now I wonder "where's next"?

The other surprise to me is ATL. Back in the day, Delta (and Northwest) always went nuclear if Frontier invaded their turf, from the very early SLC-PVR through to what happened at MCI a couple of years ago.

But something appears to have changed and lo - this ULCC Frontier has five routes out of ATL, without Delta even saying "boo."

Can it hold? Will Delta let this IAD expansion - to ATL, DTW and MSP - go unchallenged? Or does Delta think the greater harm might be to United?

Or has Delta come to understand - as it appears to have done with Spirit - that Frontier's market is no threat to Delta?