Over on airliners.net (hardly the most reliable of sources I know), there is discussion of AA using a domestically-configured 757 on a new BOS-MAN route from this summer. The thread states that full Y passengers would get the F seats, with this being sold as a single class flight.

http://www.airliners.net/discussions....main/1327635/

I have heard from other sources that AA have applied for slots at MAN to serve BOS, but have no corroboration for any of the rest of this.