Notes
Line chart showing Sea-Tac Airport noise hotline call volume (in thousands) per month from 1986 through the first quarter of 1990. Data series plotted for each year: 1986, 1987, 1988, 1989, and 1990 (January–March only). Notable spike labeled ‘1987 Scatter Test’ reaching approximately 3.4 thousand calls in July 1987. Chart tracks seasonal patterns in noise complaint call volume across all twelve months.
