In message , at 14:57:39 on
Tue, 8 Jun 2010, Bruce remarked:
Also, you are being deliberately misleading by suggesting that modern
Heathrow could have had six runways, because only a maximum of two
parallel runways could ever have been in use at any one time. So
whichever way the wind blew, the design allowed for only two runways
to operate.

And the two they are left with are the pair best aligned with the
prevailing winds.
--
Roland Perry