Why not just tie them together like Pprune Pop did?
Actually I'm recruiting ex-mil pilots (for both seats) at the moment for a new airline 'Diamond9 Airways' - timed sequential launches from airfields along the route and sequenced 'dropping offs' across the pond, and of course some nifty formation changes mid-Atlantic to share out the savings.
One big benefit will be the reduced oceanic track loading, and the fuel saved will enable pilots to go up to 14% further past planned destination than at present.