One thing first
I sceptical about UFO cases see here
https://www.secretprojects.co.uk/threads/rambling-about-ufo.50359/
let's recall
The Berlin wall had just fell and East Europe were kicking the Communist regimes out
I was with friend in Verviers and drove back via Henri-Chapelle (i was passenger)
around Hockelbach i notice what i thought was three low flying AWAC airplanes direction Highway E40
in 1989 were the AWAC airplanes very active and regular fly low toward/from the NATO Geilenkirchen AFB.
from Henri-Chapelle we drove Welkenreadt as bunch of Gendarmes with blue light flashing racing to Henri-Chapelle
those Gendarmes witness a Triangel craft hovering near old people's home in Henri-Chapelle
One of them say that a red light detach form Triangel and flew around old people's home return to it
then the craft move slowly to E40 highway
in mean time at near highway E40 exit 39 a Gendarmes see searchlight coming from above.
They Following It to town of Eupen, there i arrived and left the car as i walk to my destination.
i notice that triangle lights fly very slow parallel to Aachenerstrasse, while Gendarmes with blue light flashing driving by.
It made no noice like AWAC airplanes or powered Paraglider, the Street sounds were louder as it's engine !
later that Craft would in next village Baelen activate again it searchlight illuminating backyard to daylight.
the witness there described it as Larger as Boeing [747] and making humming sound,
In mean time the crafts were see moving along E40 direction Liege as there using the illuminate highway to navigate
Allot NATO and Belgium military aircraft use the Belgium Highways for navigation.
At Liege the Belgium Military got them on Radar, ensued F-16 interception failed...
i don't recalled how i ended up at SOBEPS, that was 37 years ago.
They weren't cooperative to me, but i got there Dossier about the Event later.
During Spring and Summer 1990 were another sighting.
i saw light arrange in rectangle with blinking lights between them, flying fast in Night sky again no sound.
also several nights in that time period were humming sound to hear.
I convince what i saw in that November Night is unknown military aircrafts,
What operate in East block during November and return from that Mission.
The Timing and way "they" use the Highways to Navigate indicate Military operator
sadly the release date for such classified operation would be in 2039...