The 2007 DNL contour map was not developed using noise measurements from the RMTs. The Federal Aviation Administration (FAA) outlines that the Integrated Noise Model (INM) be used to predict noise impacts around the vicinity of our nation’s airports and to develop the boundaries of Part 150 programs, including sound insulation. The INM uses numerous variables as inputs in the development of noise contours. Actual aircraft flight paths, forecasted number of operations, aircraft noise measurements from the FAA’s Part 36 noise standards certification database, aircraft types, atmospheric conditions, terrain, aircraft performance and other variables are used. The INM adds a 10-decibel nighttime noise penalty to aircraft operations expected to occur between the hours of 10 p.m. and 7 a.m. to take into consideration the relatively low nighttime ambient noise levels and the fact that most people are sleeping during this time. These variables are then used to map an average annualized day of noise impacts considering all arrivals and departures to and from the airport. The FAA’s INM methodology is universally recognized and applied at all U.S. airports.