I noticed on enroute charts that some airspaces (mainly over Balnkans - e.g. LWSS, LYBA, LDZO, LOVV etc) do not have high-altitude IFR airways. Unfortunately searching online didn't reveal much. What could be the reason for that?

Thank you in advance!

Image depicting the lack of high IFR airways (courtesy of Navigraph)


1 Answer 1


The areas without routes are the free route airspace of the FAB-CE (functional airspace block Central Europe).

In this airspace, IFR flightplans are not bound to airways and routes can be planned to best suit the needs of the aircraft operators.


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