Originally Posted by
anabolism
I called AA RTW and an agent confirmed that each line can be flown only once, but multiple lines are permitted. Agent confirmed I can fly a triangular route such as SYD-PER-DRW-SYD.
All these rules are really interpreted by the agent involved. Just need to find a willing agent to issue the ticket according to his/her understanding of the rule.
I find the rule quite vague in general.