How about concrete with a asphalt overlay AL ----- Original Message ----- From: "Alireza Alivandivafa" <DEmocrat2n@xxxxxxx> To: <AIRLINE@xxxxxxxxxxxxxxxxx> Sent: Friday, June 27, 2003 2:03 AM Subject: Re: Long runway means business.......... > They are normally made of either asphalt or concrete. I can't recall which, > but I have seen major airports with main runways made of asphalt. > > To the other question, the additional 1600 feet does make a difference. One, > a hot summer day at DEN is 80-90, where as a hot summer day at LAS is 115. > That evens them out some. Also, adding that extra usable runway means that you > can run the plane longer down without as much danger of running out of > pavement. Take, for example, when they tow out to JFK's 14k runway, airlines like > Cathay probably use 12k feet. So, at DEN, they will use 14k feet, which would > be scary at LAS or JFK. > > In a message dated 6/26/2003 3:48:02 PM Pacific Daylight Time, > yul@xxxxxxxxxxx writes: > > << This brings up an interesting point with respect to > construction. What are runways composed of? If you > noticed, on the taxing out to the active, you'll see > the active is being "scored" every few inches or > greater. I would think asphalt, but there must be > more to it. Anyone in airport inspection or > construction have any insight here >> >