Very interesting idea on the open itinerary. This of course put put you at risk at not getting flights, particularyly if you're economy looking for M class travel. But the other thought I have is, surely they would track the tickets being issued. They are numbered in sequence. Would there not be some sort of tracking this? Of course who am I kidding....the majority of ticket agents just aren't familiar enough with ONE ticketing that it probably wouldn't be a problem. Curious what the RTW desk would say to this if you ask as a purely hypothetical question.