The recent Belgian defense restructuring has had some consequences for radio callsigns:
The A.109's callsigns "AYB 6xx", "7xx" and "8xx" were replaced by "BAF 3xx"-callsigns since last month.
The navy's Alouette 3's "NYB 4xx" seems to have been replaced by "BAF 7xx". Credit: Otto in Woensdrecht forum
(The "BAF 7xx"-callsign has been the callsign for Koksijde's Sea Kings for many years as well ofcourse)
Stephan