Ufo
In the late 90's ( I don't have the exact date) I was passing through the Belgrade FIR at night. I overheard a transmission from a Speedbird aircraft, which was describing to ATC a bright triangular object which was seen to be following an American aircraft, (Delta I believe.) The object was under observation for over 5 minutes and was also reported by other aircraft. I have always expected to hear more of this event, but nothing was reported officially. If any of the pilots involved read PPrune forums, perhaps they would like to tell us more?