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I've had issues with the oneworld online tool because it wouldn't recognise some <24hr cities as transits. I think the tool also picks the first segment airline as the ticketing airline, so you might have difficulties getting the route/dates changed later on if that's a consideration. I would personally go with the AA desk unless you had a good reason not to (e.g. don't want AA codes due to being in the AAdvantage programme which is revenue-based status)