Originally Posted by JJeffrey

I would not make that assumption, and if you only need to go to HNL then I certainly would not leave everything up to the check-in agent.

AA's IT can be wonky, I have seen the "multiple flights" thing several times for one-way itineraries that are just more complex. It does not necessarily mean than you can just remove the other flight or only tag your bags to an intermediate stop, etc.

What is your plan B if you get to the airport and the agent insists on tagging the bag all the way to KOA?