formula Density of air Hot and high List of longest runways Notes References Advisory Circular AC 61-23C, Pilot's Handbook of Aeronautical Knowledge, U.S. Federal Aviation Administration, Revised 1997 http://www.tpub.com/content/aerographer/14269/css/14269_74.htm External links Density Altitude Calculator Density Altitude influence on aircraft performance NewByte Atmospheric Calculator Altitudes in aviation Atmospheric thermodynamics