If your journey is of a private nature, then,
in the case of flight disputes, you have the right to contact the ‘Schlichtungsstelle für den
öffentlichen Personenverkehr e.V.’ (SÖP), Germany’s independent arbitration board for public
passenger transport that oversees all carriers.
You may do so if you have concerns relating
to
The European Commission also provides a
platform for Online Dispute Resolution (ODR).