On these flight paths the lower set of 'squiggles' (loops?) are roughly over the Black Forest.
Karlsruhe, Germany roughly northern edge; Freiburg, Germany, middle and eastern edge; Lake Constance (Swiss border) southern edge of Black Forest.
Black Forest is the wooded uplands on the eastern bank of the Rhine valley in SW Germany.
This may be something re: squiggles in flight path.