Action Items
Description

Components

Change

Key
Responsible
Parties
Status
Update

Late Night Noise Limitation
Program
Voluntary measure to reduce late
night (12:00 AM to 5:00 AM) noise
by incentivizing air carriers to fly
at less noise sensitive hours or
transition to quieter aircraft
 Ongoing outreach with air
carriers about possible late
night schedule and aircraft
fleet changes including
meetings with carriers with
the most noise exceedances
 Established noise thresholds
that identify aircraft exceeding
noise thresholds during the
late night hours
 Late night noise threshold
observance tracked and
reported out on a quarterly
basis and publicized as part of
the Fly Quiet Program
Reduction of aircraft noise during
the late night hours

SEA Stakeholder Advisory Round Table (StART)
Aviation Noise Working Group
Aviation Near-term Noise Action Agenda Summary (as of 5/25)
Runway Use Program
Glide Slope Adjustment
Promoting Single Engine
Discouraging Reverse
Taxiing
Thrust
Revise the current informal
Raise Runway 34R's
To minimize noise and
When conditions are right,
Runway Use Program to minimize glideslope to lessen aircraft fuel burn, encourage
discourage overuse of
use of the Third Runway during
approach noise
single engine taxi when
reverse thrust to decelerate
the late night (12:00 AM to 5:00
safe and conditions
aircraft
AM)
permit.
Updated language for:
Considered various
Taxiing aircraft were
Reverse thrust was
strategies and timelines for identified as a source of identified as a source of
 Third Runway
raising Runway 34R's 2.75
noise in StART's 2022
noise in StART's 2022
daytime/evening runway
degrees glideslope and
Ground Noise Study
Ground Noise Study
usage
settled on plan to
 Third Runway late night
permanently relocate 34R's
runway usage
navigational aids and
pursue a 3.0 degrees
glideslope with the FAA

Reduction of aircraft noise for
Third Runway adjacent
communities and communities
underneath the Third Runway's
flightpath

Potential reduction of
aircraft noise for
communities south of SEA

Port of Seattle, airlines and air
cargo carriers

Port of Seattle and FAA

Port of Seattle and FAA

COMPLETE: Program commenced
in July 2019 with regular reporting
each quarter to external
audiences. EVA Air and FedEx
Express, two carriers that Port
staff met with as part of the
Program's outreach, did
eventually incorporate newer,
quieter aircraft into their fleets.

COMPLETE: Implemented in
September 2019. Late night
operations on the Third Runway
dropped dramatically from an
average of 12 late night landings
pre-implementation to an average
of less than two late night landings
in 2023. The average has
fluctuated since 2023 but remains
well below the preimplementation average. Usage
continues to be monitored and
details communicated at StART
meetings.

IN PROCESS: The 34R glide
slope adjustment is
incorporated into a SEA
taxiway reconfiguration
project. Preliminary design
is complete.
Implementation is
contingent on the
Sustainable Airport Master
Plan's (SAMP) finalization
and FAA approval.

Item No. 11b_attachment_6
Meeting Date: May 27, 2025

Encouraging Continuous
Taxi to Takeoffs
When conditions are
right, promote
continuous taxi to
takeoffs (rolling takeoffs)
Traditional takeoffs were
identified as a source of
noise in StART's 2022
Ground Noise Study.

Noise Comment
Reporting
Provide up-to-date,
accessible information on
noise complaints and
comments submitted by
the public
Monthly statistics and
heat map reports posted
on Port website detailing
totals and trends by city,
zip code and subject
matter. Regular updates
regarding noise complaint
data provided at StART
meetings.

Modest reduction of
aircraft noise and a
measurable effect on
reducing aircraft
emissions for close-in
airport communities
Port of Seattle, FAA and
airlines

Reduction of aircraft noise
for close-in airport
communities

Modest reduction of
aircraft noise for
communities close to the
runway ends

Transparent and
convenient information
on noise complaints and
comments submitted by
public

Port of Seattle, FAA, airlines
and air cargo carriers

Port of Seattle

COMPLETE: New SEA
voluntary language
promoting use of single
engine taxiing
implemented in October
2024.

COMPLETE: Updated SEA
voluntary language
discouraging use of reverse
thrust at all times and
beyond what is necessary,
implemented in January
2023.

Port of Seattle, FAA,
airlines and air cargo
carriers
COMPLETE: New SEA
voluntary language
promoting use of
continuous taxi to
takeoffs implemented in
July 2023.

COMPLETE: Monthly
reports began in June
2020.