Ground stop at Boston Logan (BOS), Oct 12, 2026

EndedLow cloud ceilings halt departures from Boston Logan for 49 minutes

Started: Mon, Oct 12, 5:12 PM EDT21:12 UTC
Ended: Mon, Oct 12, 6:01 PM EDT22:01 UTC
Duration: 49 min
Cause: low ceilings; Extended 1 time

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What happened

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

Cause: Low cloud ceilings at Boston Logan made it unsafe for planes to take off, so air traffic control held departures there.

The ground stop began at 21:12 UTC and was extended at 21:41 UTC, with its end time moved to 6:00 pm EDT. It ended at 22:01 UTC, after 49 minutes, and departures bound from Boston Logan were held from one air traffic control center during that time.

Impact by airline

Aircraft seen on the ground at BOS and holding nearby, by airline.

Airline	On ground	Holding
Delta Air Lines DL	7	—
American Airlines AA	5	—
JetBlue B6	5	—
Republic Airways YX	3	—
Cape Air KS	2	—
Southwest Airlines WN	2	—
Air Canada AC	1	—
Alaska Airlines AS	1	—
Aer Lingus EI	1	—
Envoy Air MQ	1	—
Iberia IB	1	—
ITA Airways AZ	1	—
Japan Airlines JL	1	—
SAS SK	1	—
Swiss LX	1	—

Impact by region

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

Center	Status
Boston Center (ZBW)	Held

Aircraft at the airport

Peak 41 on the ground, 0 holding nearby.

On the ground Holding nearby

Timeline

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

Oct 12, 5:12 PM EDT
Ground stop issued at BOS for low ceilings, until 5:45 pm EDT.
Oct 12, 5:13 PM EDT
Chance of extension now low.
Oct 12, 5:13 PM EDT
Departures held from ZBW.
Oct 12, 5:40 PM EDT
New advisory issued.
Read the advisory ↗
Oct 12, 5:41 PM EDT
Reason changed to low.
Oct 12, 5:41 PM EDT
Extended until 6:00 pm EDT.
Oct 12, 5:42 PM EDT
Reason changed to low ceilings.
Oct 12, 6:01 PM EDT
Ground stop ended after 49 min.

Advisories

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

ATCSCC ADVZY 094 BOS/ZBW 10/12/2026 CDM GROUND STOP

CTL ELEMENT: BOS
ELEMENT TYPE: APT
ADL TIME: 2135Z
GROUND STOP PERIOD: 12/2054Z - 12/2200Z
CUMULATIVE PROGRAM PERIOD: 12/1115Z - 13/0359Z
DEP FACILITIES INCLUDED: (Internal) ZBW
PREVIOUS TOTAL, MAXIMUM, AVERAGE DELAYS: 1219 / 185 / 111
NEW TOTAL, MAXIMUM, AVERAGE DELAYS: 1353 / 199 / 123
PROBABILITY OF EXTENSION: LOW
IMPACTING CONDITION: WEATHER / LOW CEILINGS
COMMENTS:

Original advisory ↗

ATCSCC ADVZY 090 BOS/ZBW 10/12/2026 CDM GROUND STOP

CTL ELEMENT: BOS
ELEMENT TYPE: APT
ADL TIME: 2104Z
GROUND STOP PERIOD: 12/2054Z - 12/2145Z
CUMULATIVE PROGRAM PERIOD: 12/1115Z - 13/0359Z
DEP FACILITIES INCLUDED: (Internal) ZBW
PREVIOUS TOTAL, MAXIMUM, AVERAGE DELAYS: 735 / 131 / 74
NEW TOTAL, MAXIMUM, AVERAGE DELAYS: 1119 / 185 / 112
PROBABILITY OF EXTENSION: LOW
IMPACTING CONDITION: WEATHER / LOW CEILINGS
COMMENTS: GS TO BUILD RECOVERY ROOM FOR DEMAND THAT HAS COMPACTED

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 BOS 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 BOS, every 30 minutes while active and once more after the end. Delayed means 15 or more minutes late at BOS; 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 BOS 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 BOS, 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.