We were flying our model planes at our flying field in Korangi Creek Khi.
I had packed up my plane and was waiting for this gentleman to finish flying so that we could leave. It was late evening and shadows had started to lengthen, but there was full sunlight in the sky and the sun had not set.
As I stood there watching, this model plane flew by, I thought that something fell off it, but realized that it was something in the sky that the model had passed in front of.
When I focused in on it and I got a shock as it was a boomerang shaped object, spinning round like one, white in color, that helped in spotting it, full sunlight shining on it.
The forward velocity of the object was not very fast at all, southerly heading, and the size I approximated to be around a Boeing 737 as seen at cruise altitude.