Thanks alot Forget, An object can indeed refer to anything, so saying flying objects couldn't be any perfect. Besides, some radars (Eurocontrol - Military) can detect UFO's, Birds flying about, so the writer saved his time by refering to
other flying objects.
It seems to me that some of us are only here to look for mistakes made by others rather than learning and taking the content on board. We have young guys using these forums to try and learn from us, so lets be productive and share our expertise.