Never tried photographing high flying aircraft before so here's a couple of attempts of what was going overhead today. I don't have anything beyond a cheapo slow 55-200m lens and it was hazy today, so the pics are kinda rubbish, but here's a couple of pics cropped from pics I took of planes flying overhead near where I was today. The details are according to what the Flightradar.com website said was in that position at that time and flying in that direction.
Flight UN8762 Transaero Boeing 767 @ 37,000ft (no source or destination given)
Flight LS382 Jet2Holidays Boeing 737 @ 31,000ft Tenerife - Belfast
Very good shots. What body are you using, those seem as good as my 500mm shots on a Canon 7D.
Either I'm doing something wrong, or I need a new camera.