Aircraft leaving major airports generally follow one of a number of Standard Instrument Departure (SID) routes allowing departures to N, S E & W as required.
Some Heathrow departures to the US, generally to the mid west and beyond fly north first up my way and follow (when wind is in west) a Wobun SID that takes them over Slough/Wycombe towards a waypoint near Woburn. Those going out on more southerly tracks eg to JFK or EWR use Compton SID which go via Woodley to the Compton radio beacon in South Oxon.
The chart for the Compton SID is here tinyurl.com/bugpenq , you will see that, particularly when the Northern runway (27L) is in use they involve a significant jink to the south.
So no, I don't think they're doing anything unusual.
link corrected
Last edited by: VxFan on Tue 31 Jul 12 at 21:12
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