Mike,
ok then I take back the thanks.

Perhaps I was happy to find a lot of DLH flights with correct routes.
Dublin1
thanks for this informative link.
But I still wonder why a lot of flights are correct at RV whereas the information is missing or wrong at FR24. I don't think they at RV have hundreds of individuals correcting every day/month the routes. There must be a better solution to help Mike (and others) doing the updates.
In the case with DLH flights its as I told. The correct information is in the database, but in many cases the incorrect information is picked up. So it seems that the correct lookup works in one direction only.