I am not able to obtain Fare listings using the Fares Dot Res option when selecting United Airlines(or any other specific airline like AA, DL, etc.) as the airline to search(e.g ORD-LHR route). I get a datasource error. Is there an option to make this work? I do get fare listings when selecting search all airlines, but this does not help me, as I wish to search United or one specific airline's fare listing and classes for a specific route.