Free Route Airspace
European Supplement
urn:aero:ses:eurocontrol:airm:1.0.0:ContextualModel:ATMBusinessTerms:EU:Free_Route_Airspace
a specific airspace within which users can freely plan their routes between an entry point and an exit point without reference to the ATS route network
Source:
EU/EC COMMISSION REGULATION (EU) No 677/2011