Today was superb for visuals of the Airliners in the UK South / North Air Corridor. The clear blue sky made it easy to observe Aircraft travelling North 'over my back garden' and South 'over the front'.
Here is just one Plane of the constant stream which passed my QTH and my 6m Vertical Dipole today.
Right Click and select View Image for full view.

It would be interesting to find the true distance at which this one passed, I estimate 1 Mile. I think Aircraft in the Corridor can be anything from Overhead to 20 Miles away.
