It's the Biggin Hill air show today and we live quite close by and have seen quite a few planes go over today.
Earlier on 2 planes (DS thinks they were Tomcats) flew over head at fairly low altitude and DS was jumping up and down waving at them. They circled and this time 4 of them came over lower this time, and they banked and split directly overhead.
DS is pretty sure they saw him the first time and came back to give him his own personal air show I cautiously advised that I thought it was unlikely that at that speed they could see much on the ground, but promised I would ask someone who might know the answer!
He is rather in awe of the fact that I 'know' someone who is married to a fighter pilot - in the way that only 8 boys can be
So if Mr MB wouldn't mind answering the question it would seriously enhance my credibility with my DS!