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Hi Reinhold -
You can use the generated latitude and longitude, but there is a trick to it. I hadn't seen this problem with airport codes before, but it comes up frequently when trying to use Tableau geocoding data in different states or countries. The way around this is to change the airport dimension to a measure and set it to minimum (image below). What this does is tells Tableau to stop breaking up the paths based on airport code. When it splits based on the airport code then it doesn't see both sides of the path...but using min seems to say 'these aren't dimensions to split on, so go ahead and draw the path!' I've attached a workbook for an example. I hope this helps! If not, let me know and I'll see what I can do to help out.
So helpful. Thank you Sarah.
Thanks a lot Sarah, this really did the trick !
Of course this was not obvious at all.
It could be very helpful if this would be documented somewhere within the Tableau help function or even a short tutorial.