A lot of SFO's traffic is heavy. You have Cathay Pacific, Japan, Qantas, United, Nippon Cargo, Cargolux, Singapore, and many other airlines operating very large jets. David R -------------- Original message ---------------------- From: Gerard M Foley <gfoley@xxxxxxxxxxxxxxx> > 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/