IIRC, Madrid was a connecting city used by some teams to get out of Morocco back in TAR 3, and that was a leg headed towards Germany/Austria.
So that raises the possible inference of either a leg in Spain (they haven't had any clues anywhere in Spain outside of Barcelona TAR 10 (IIRC), and the port in TAR 3 to head to Morocco) or a leg in Morocco (where they have not been in a long time.)
This is pure speculation on my part based upon trying to understand what the flight from Madrid to Vienna implies.