Back in the mid 1980's I was on a JAT (Yugoslavia as was) flight from Ljubljana and not being a frequent flyer I wasnt used to the normal east west pattern of today. However I was surprised to come in over the GWR (Western region back then) mainline in the vicinity of Southall as I recognised the surroundings from my frequent Didcot to Paddington rail trips. Google earth still shows the remnants of a V shape from terminal 4 leading NE and NW across the airport although now built over in most places. Was my experience unusual as presumably our flight path would cut across both the current runways. Plane was a 727 as we had the unusual entry via the rear door that lowered down below the tail, never done that again either.