I have no idea, but.....
We got ourself in the bind of not being able to add/start mainline flights in one market without taking the equipment from another market. Except for the E-190's, there doesn't seem to be any prospect for improvement till mid-2008.
Of the top 10 markets from DCA (based on enplaned passengers), we serve 3 with daily mainline service - BOS/LGA with the Shuttle and CLT. Of the top 10 markets, 2 - BOS & LGA - have seen traffic declines (9.9% & 1.5 respectively) since 2003 although DCA traffic overall is up more than 31% over the same period. CLT traffic is up, but only 5.5%.
Jim