QUOTE
Not to disrupt the rhythm of such a lively thread, but LHR's not been the world's busiest international airport for donkey's years, and that's one of the most pervasive untruths in the UK media.
Last time I looked it was ATL for pax and MEM for cargo. May have changed since, but LHR ain't even in the frame these days. Unless, maybe, you divide total movements by available runways...
UNQUOTE
You need to look carefully at the wording. It asserts that Heathrow is the world's busiest airport in terms of international (as opposed to domestic) movements, and I think that is still true. LHR is indeed a long way down in the league of total movements, but last time I checked (which was a while ago...) it topped the list of international moves.
Also sorry for going off on a tangent...