Ground stop at BFI (BFI), Nov 5, 2026

EndedDepartures to BFI held one hour due to heavy traffic

Started: Thu, Nov 5, 4:16 PM UTC16:16 UTC
Ended: Thu, Nov 5, 5:16 PM UTC17:16 UTC
Duration: 1 hr
Cause: airport volume

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What happened

AI-written · may contain mistakes. Written from the advisory text and weather only.

Cause: Too many flights were trying to use the airport at the same time, so departures from three air traffic control centers were held.

The ground stop began at 16:16 UTC and was lifted at 17:16 UTC, after one hour. The delays reached a total of 230, with a longest delay of 66 and an average of 46. The stop was not reported as extended.

Impact by airline

No airline data was collected for this ground stop.

Airline numbers appear after the first sample, within about 20 minutes of the start.

Impact by region

Air traffic control centers whose departures to the airport were held.

Center	Status
ZLC	Held
ZOA	Held
ZSE	Held

Timeline

Every change published while the ground stop was in effect, as seen each minute.

Nov 5, 4:16 PM UTC
Ground stop issued at BFI for airport volume, until 9:15 am PST. Departures held from ZLC, ZOA, ZSE.
Nov 5, 5:16 PM UTC
Ground stop ended after 1 hr.

Advisories

The air traffic control advisories issued for this ground stop, as published.

ATCSCC ADVZY 033 BFI/ZSE 11/05/2026 CDM GROUND STOP

CTL ELEMENT: BFI
ELEMENT TYPE: APT
ADL TIME: 1613Z
GROUND STOP PERIOD: 05/1558Z - 05/1715Z
DEP FACILITIES INCLUDED: (1stTier+CZV_AP) ZLC ZOA ZSE  CYEG CYVR CYYC
 CYYJ CYLW
PREVIOUS TOTAL, MAXIMUM, AVERAGE DELAYS: 0 / 0 / 0
NEW TOTAL, MAXIMUM, AVERAGE DELAYS: 230 / 66 / 46
PROBABILITY OF EXTENSION: MEDIUM
IMPACTING CONDITION: VOLUME / COMPACTED DEMAND
COMMENTS:

Original advisory ↗

How it is measured

Status, timeline, cause and held centers: the national airspace status feed, checked every minute, and the air traffic control advisories it links to.
Delays by airline and region: departures and arrivals at BFI 30 or more minutes late, by their estimated delay against the schedule, sampled every 10 minutes while the stop is active and once more after it ends.
Totals and cancellations: arrival and departure boards for BFI, every 30 minutes while active and once more after the end. Delayed means 15 or more minutes late at BFI; cancelled is the airline's cancelled status; codeshares count once. Flights scheduled from the start until an hour after the end are counted.
Held at origin: the same arrivals boards, which carry each flight's scheduled and actual departure from its origin. A flight is held when it is still scheduled, not departed, 15 or more minutes past its scheduled departure at a sample taken during the stop. In scope: its origin is in a held center or listed facility; flights from elsewhere are late for other reasons.
Inbound in the air: the same arrivals boards. At each board taken during the stop, a flight to BFI is in the air when it has departed (en route, or with an actual departure time) and not landed, cancelled or diverted; one still shown in the air over an hour past its arrival estimate, or departed more than 18 hours earlier, is treated as stale and left out.
Diversions: an inbound flight marked diverted during the stop or the wrap-up after it (not one marked before it could have departed), or one still shown in the air 30+ minutes past its arrival estimate that ADS-B (by its ICAO call sign) then found on the ground at another airport, not its origin. The diversion airport is the airport ADS-B found it at, else the updated destination. Cancellations never count. Regional flights flown under another call sign can't be found on ADS-B, so their diversion airport may be unknown.
Aircraft on the ground and holding: ADS-B positions around BFI, every 5 minutes; the airline is read from the call sign. Holding counts airline flights only (passenger, regional and cargo), not private, military or medical flights.
Weather: METARs, SIGMETs and weather alerts.
News: headline links filtered to this airport and these days; we show titles and links only.

Data sources are listed on the credits page.