Firstly I don't think this is going to come back as Manchester - New York is already well served and American have been unable to operate a succesful second route from MAN having binned JFK, BOS, DFW and MIA.
Secondly can someone confirm that the Saudia opearates RIH-JED-GVA-MAN?
Is that right? Two stops from Riyadh surely means it's less hassle over LHR?
Thanks