I was also surprised but that's the case, neither of my scenarios seem bookable on Orbitz, Delta, Expedia, or even show up as an option on ITA.
Originally Posted by
3Cforme
Check fare rules for BNA-TPE. Maybe DL's (cheapest) thru-fares don't permit the CI LAX-TPE segment. One can pull up fare rules for proposed itineraries on ITA Matrix.
I would be surprised if Orbitz couldn't book the multi-city routing you suggest but if that yields a broken fare (like BNA-LAX + LAX-TPE) the price may not appeal to you.