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Originally posted by stumason
reply to post by Uncinus
Hardly surprising, really. 3 major international airports to the North, South and West of London with air traffic pretty much 24/7 (except the really early hours)..
The grid patterns you see (this is to the other poster) are the holding patterns as well as the flight paths. On a busy day, there can be dozens of aircraft circling just waiting to land, all criss crossing at different heights in the stack, waiting their turn.