
Slide 7 from a Sea-Tac Airport presentation comparing the 65 Day Night Level (DNL) noise contours for 1998 (blue outline) and 2018 (red outline), overlaid on a regional map. The caption notes that the 2018 contour is smaller than the 1998 contour due to quieter aircraft technology.Open full document
Notes
Slide 7 from a Sea-Tac Airport presentation comparing the 65 Day Night Level (DNL) noise contours for 1998 (blue outline) and 2018 (red outline), overlaid on a regional map. The caption notes that the 2018 contour is smaller than the 1998 contour due to quieter aircraft technology.