One request for the ITA people, which I'd hope would be quick and easy: changing the settings to allow airport changes on only one of origin or destination. I'm often happy to change airports in my destination city, but if my car's at MHT, returning to PVD isn't a very good option (o:

As for Comets -- sign me up for the beta! It's great to see an app out there that's OS X compatible.

d.