Autists Assemble!!
I have caught a few strange call signs, one of which is kind of obvious, the other not so much. 'ABCDEFG' is the beginning of the alphabet, possibly denoting the start of habbenings, or bad things happening to the former Google.
'R0530909' isn't quite as obvious, maybe 9th September 1953? Is that a notable date and if so, why? I need a decode, as this is a former AZAZ0909 flight and the 0909 is common.