is there a way we could see which circle goes with which airport. Below is the picture of Southern England and it's next to impossible to see which airports have large circles and which don't. Perhaps as I hover my mouse over an airport, that airports circle goes bold or otherwise highlighted?
Simon
I like that idea--set the circle to be dashed/dotted and more transparent until you hover, then make it solid and more opaque when you hover over the airport marker.
You can always open the airport that you can't tell in a separate tab.