Wonder no more. For ages I have maintained that most of the planes that fly over our head are to or from London (most of the locals says it's Paris), but now we have proof.
What has made the difference is Planefinder, which is ace.
For instance, I know that this plane (flying 11km above Preuilly sur Claise)is an Easyjet flight from Stansted STN (London) to Son Sant Joan PMI (Mallorca in Spain)
and that this planeIs a Thomas Cook Airlines flight. Planefinder doesn't tell me where it's from or where it's going, but minimal research tells me it's going from Gatwick to Mallorca (and that it's actually flight TCX1212 which is running late)
All from looking at this map of Planes over Preuilly. For a broader view of planes over France use this map.
Pretty good, eh what...