Richard, This link, http://www.faa.gov/atpubs/aim/Chap7/aim0702.html, will give you the scoop for altimeter settings/terms for US operations. Walter DCA ----- Original Message ----- From: "W Wilson" <wlw-jr@att.net> To: <AIRLINE@LISTSERV.CUNY.EDU> Sent: Sunday, December 30, 2001 22:42 Subject: Re: Contrails > Without going into a long discussion.....Not flight level 25,000 feet. Call > it 25,000 feet ..... leaving off the "flight level". In very simple terms, > over the U.S., an altitude 18,000 feet or above is termed as Flight Level > (knocking off the last two zeros) since the altimeter reference is set to > 29.92 in Hg for flight operations. Lower than 18,000 feet, the altitude is > the indication read directely off the altimeter, set to a "local" (within > 100 miles) altimeter setting....(Ex...ATIS mentions the alitmeter setting). > > Walter > DCA > > ----- Original Message ----- > From: "Richard A Whitenight" <rum.runner@juno.com> > To: <AIRLINE@LISTSERV.CUNY.EDU> > Sent: Sunday, December 30, 2001 15:36 > Subject: Re: Contrails > > > > When you guys speak of FL250, are you saying "Flight Level 25,000"? > > > > On Sun, 30 Dec 2001 14:27:22 -0600 Dennis Murphy > > <dmurphy4@houston.rr.com> writes: > > > Way back when.......... > > > > > > I've pulled contrails with my Cessna T-210 (circa 1974) over > > > Colorado & > > > Kansas in the winter. My Bonanza A36TC would do the same. I don't > > > remember > > > what altitude, but I do remember it was lower than FL250 (maximum > > > "certified" ceiling on both aircraft.) For what's worth, the > > > Bonanza was > > > more "fun" to fly......... > > > > > > Dennis Murphy > > > > > > ----- Original Message ----- > > > From: "W Wilson" <wlw-jr@att.net> > > > To: <AIRLINE@LISTSERV.CUNY.EDU> > > > Sent: Saturday, December 29, 2001 10:05 PM > > > Subject: Re: Contrails > > > > >