I couple of weeks ago, I spent two hours in the air flying up and down the coast around Wollongong.
That just happens to be a very busy travel path.
Whilst there, I must have seen 15 or more planes, microlights and helicopters - both above and below me - coming from ahead and behind.
I made radio calls everytime I changed course from North to South with my altitude so that other planes were aware of my position.
Some of these are hard to spot... can you see the plane?