I spent a lot of time on the phone yesterday with an AA OW supervisor. She stated that as far as OW's are concerned there is no problem having, for example, ex - BUD tix issued in the US at the HUF price! She said this is true with any OW tickets issued edx anywhere.
On a different note she would not allow
- world - HKG - SYD - HKG < 24hours next flight out to LAX. Many posters have said it is possible, so I am still working on that one!