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Late Night Noise Limitation Program

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aircraft taking off at night at sea-tac airport

About the late night noise limitation program

The Late Night Noise Limitation Program is a new, voluntary Port of Seattle program designed to reduce late night noise at SEA Airport by encouraging air carriers to fly during less noise-sensitive hours or transition to quieter aircraft.  The program was developed to increase air carrier awareness of the impact of aircraft noise on local communities.  

  • Focuses on the hours of 12:00 a.m. to 5:00 a.m. to help alleviate late night aircraft noise within the community
  • Captures noise levels for any take-offs and landings between these hours using four close-in airport noise monitors; noise level data collection began July 1, 2019
  • Reports out any exceedances of noise thresholds to the public and air carriers on a quarterly basis
  • Beginning in 2020, a penalty score will be assigned as part of the Port’s Fly Quiet Incentive Program if an operation exceeds an established noise threshold
  • Single Event Noise Exposure Level (SEL) is the metric the program uses to measure aircraft noise at the four monitors. SEL is measured in decibels and represents the total sound energy from an aircraft operation at a given location.

Noise monitorslocation of noise monitors used for late night noise limitations program

The Late Night Noise Limitation Program is an outcome of the Sea-Tac Stakeholder Advisory Round Table (StART).  StART, formed in 2018, brings together the Port, FAA, air carriers, and local airport communities to support collaborative dialogue on airport-related issues and to identify practical solutions to reduce the airport’s impacts on local communities.

The four close-in monitors used to capture noise are monitors 12 and 13 north of the runways and18 and 19 south of the runways.

To expand the Noise Monitor Map and view the established noise threshold at each monitor, please click the map. Learn more about the Port's Aircraft Noise Monitor System.

For any questions, comments or concerns regarding Airport Noise, please contact the Airport Noise Programs Office by phone at 1 (800) 826-1447, (206) 787-5393 or by contacting us using our comment form.

2nd quarter, 2021 late night noise limitation program report

All airlines with late night operations that exceeded noise thresholds during the quarter are displayed below along with their late night total operations and the exceedance percentage of their late night total operations. They are ranked from the most exceedances to the fewest.  For a more detailed look at the specific operations that exceeded thresholds along with a list of all airlines that operated during these hours, please view Full Report.

Download Full Report

Airlines with exceedances during late night hours in the 2nd quarter, 2021




Airline Name


Total Late Night Operations

Total Number of Exceedances

Percent of Exceeding Operations

FedEx Express CRG 84 51 61%
China Airlines Cargo CRG 47 32 68%
Asiana Airlines Cargo CRG 27 27 100%
ATI (Amazon Prime Air) CRG 404 23 6%
Cargolux CRG 18 18 100%
Korean Air Cargo CRG 53 9 17%
Kalitta Air Cargo CRG 14 8 57%
Delta Air Lines PAX 229 8 3%
Aerologic CRG 19 4 21%
Atlas Air PAX 3 1 33%
Hawaiian Air PAX 3 1 33%
Alaska Airlines PAX 390 1 Less than 1%

*Operation type is indicated with "PAX" for passenger airline carrier or "CRG" for cargo airline carrier

Airlines with no operations during late night hours in 1st quarter, 2021:

Lufthansa, Japan Airlines, All Nippon Airlines, Emirates Airlines, Air Canada, British Airways, Jazz Aviation, Iceland Air, Aeromexico, Volaris, Spirit Airlines, Qatar Airways

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