From: "Bill Hough" <psa188@xxxxxxxx> Sent: Thursday, April 27, 2006 2:00 PM This sounds too good to be true. <snip> Suppose, on foggy or cloudy days, that the Federal Aviation Administration closed the initial 2,000 or 3,000 or 4,000 or 5,000 feet of SFO's very long runway 28R and had planes begin their landings near the runway's midpoint, that is, with 10,000 or 9,000 or 8,000 or 7,000 feet of runway remaining. Then the federal rule requiring 4,300 feet of horizontal separation between planes shouldn't be a problem, because planes approaching the right runway would always be hundreds of feet above those approaching the left runway. <snip> Will wing tip vortices be a problem? How much SFO traffic is heavy? Gerry http://www.pbase.com/gfoley9999/ http://www.wilowud.net/ http://home.columbus.rr.com/gfoley http://www.fortunecity.com/victorian/pollock/263/egypt/egypt.html http://foley.foleypages.net/~gerry/