Originally Posted by
anabolism
With both AA and JL, a flight have be D9 in Sabre or Amadeus in an ordinary record but D0 for an RTW record. The same flight for the same date shows the same restriction with AA (Sabre) and JL (Amadeus). I mention those two airlines because I haven't asked any others. I did ask a friend who books his own (non-RTW) tickets in Sabre and he was able to book the flight but told me if he proceeded it would likely come back unconfirmed later.
Amadeus can check availability using the "/PC" command to query based on Point of Commencement (PoC). Sabre will need segments from the same origin booked first before availability display changes to that specific PoC (or in case Sabre has a command for that, I haven't found it). Would be happy to try to check at some point if a flight has availability (assuming same married segment status) for a particular PoC but not for RTW. It would be difficult to match PoS, though.