This October 27, 2020 document from Seattle-Tacoma International Airport tracks the average daily number of Horizon Air Q400 turboprop aircraft making a westbound 250-degree turn over the city of Burien during full north-flow operating days. Data from July and August of both 2019 and 2020 show daily overflight counts ranging from 10 to 22 aircraft, with monthly averages rising from 16 overflights per day in summer 2019 to 17–19 overflights per day in summer 2020. The records appear intended to document trends in aircraft noise exposure for residents living under that flight path.Open full document
Notes
This document, dated October 27, 2020, reports overflight counts of Horizon Air Q400 aircraft making the westbound 250-degree turn over Burien during full north-flow days at Sea-Tac Airport. It provides daily counts and averages for July and August 2019 (averaging 16 overflights per day each month) and July and August 2020 (averaging 17 and 19 overflights per day respectively). The data shows an increase in average daily overflights between 2019 and 2020.