CO do a fair amount of promotion of the EWR-EDI route on the other side of the pond, there's always quite a few posters featuring EDI whenever you apss through EWR, and you even get the odd CO advert featuring EDI as well as their US skiing destinations down in Texas showing connections from IAH. They usually have a fair amount of promotion for new routes and summer only routes as well.
Having been through JFK last month, nothing from DL on the EDI service. OK, the service isn't in place just now, but you'd have thought that there'd be some early promotion in place.......