I don't want to misstate anything. If you only care about booking two flights that can't be booked in the same PNR because of married segment logic, of course you can book each in its own PNR and on its own ticket. But that doesn't help when you want both to be part of an RTW, which I thought was the what was being discussed. If you want, say, an RTW that includes ...LHR-LAX-JFK-MIA-EZE... but you can't book LAX-JFK-MIA as a connection, you could book JFK-MIA in its own PNR and on its own ticket, and have a ground segmentJFK-MIA in the RTW, but then you're paying extra for JFK-MIA.