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Late Night Noise Limitation Program

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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 monitorsNoise Monitor Map

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.

4th quarter, 2019 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 the Full Report.

Download Full Report

Airlines with exceedances during late night hours in the 4th quarter, 2019

Airline Code Airline Name Type* Total Late Night Operations Total Number of Exceedances Percent of Exceeding Operations
CLX Cargolux CRG 18 16 89%
CAL China Airlines Cargo CRG 38 31 82%
EVA EVA Air PAX 130 83 64%
GTI Atlas Air CRG 11 7 64%
FDX FedEx Express CRG 98 46 47%
KAL Korean Air Cargo CRG 16 5 31%
ATN Air Transport International CRG 207 19 9%
OAE Omni Air International PAX 14 1 7%
DAL Delta Air Lines PAX 445 1%
UAL United Airlines PAX 224 3 1%
ASA Alaska Airlines PAX 820 4 Less than 1%
SWA Southwest Airlines PAX 196 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 4th quarter, 2019

British Airways, Lufthansa, Virgin Atlantic, Hainan Airlines, Japan Airlines, All Nippon Airlines, Emirates Airlines, Air Canada, Volaris, Jazz Aviation, Iceland Air, Air France, Aer Lingus, Norwegian Airlines, Singapore Airlines, Asiana Airlines, and Aeromexico.

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