What happened
AI-written · may contain mistakes. Written from the advisory text and weather only.
Cause: Flights were held because of construction on the runways and taxiways at Boston Logan. The weather was calm and clear, so it was not a factor.
The ground stop began at 23:13 UTC on October 21 and was first set to last until 8 pm EDT. At 23:52 UTC it was extended to 9 pm EDT and narrowed to fewer departure areas, with a medium chance of further extension. It ended at 01:00 UTC on October 22, after 1 hour 47 minutes.
Impact by airline
Flights to and from BOS scheduled during the ground stop and the hour after it. Delayed means 15+ minutes late.
- Flights
- 168
- Delayed
- 112
- Cancelled
- 1
- Arrivals / departures
- 85 / 83
| Airline | Flights | Delayed / cancelled | Avg delay | On ground | Holding |
|---|---|---|---|---|---|
| Republic Airways YX | 37 | 32 / 0 | 62 min | 3 | — |
| JetBlue B6 | 45 | 23 / 0 | 71 min | 13 | — |
| Delta Air Lines DL | 25 | 17 / 0 | 47 min | 6 | — |
| American Airlines AA | 17 | 13 / 0 | 48 min | 5 | — |
| United Airlines UA | 11 | 9 / 0 | 48 min | 3 | — |
| British Airways BA | 3 | 3 / 0 | 26 min | 2 | — |
| Southwest Airlines WN | 3 | 3 / 0 | 49 min | 1 | — |
| Swiss LX | 2 | 2 / 0 | 38 min | 1 | — |
| Envoy Air MQ | 2 | 2 / 0 | 48 min | — | — |
| PTR PTR | 2 | 2 / 0 | 22 min | — | — |
| RZO RZO | 2 | 2 / 0 | 25 min | — | — |
| TAP Air Portugal TP | 2 | 1 / 0 | 42 min | 1 | — |
| Air Canada AC | 1 | 1 / 0 | 51 min | 1 | — |
| Jazz QK | 1 | 1 / 0 | 30 min | 1 | — |
| Porter Airlines PD | 1 | 1 / 0 | 16 min | 1 | — |
Delayed 15+ min CancelledOn ground / holding: most seen at once.
Held at origin
Flights to BOS still on the ground at their origin 15+ minutes past their scheduled departure while the stop is in effect; now as of Oct 21, 8:44 PM EDT. Held time is minutes past the scheduled departure.
- Held now
- 15
- Held during the stop
- 27
- Average held
- 1 hr 7 min
- Longest
- 2 hr 52 min
9 from airports in the stop's scope; 18 from outside it, late for other reasons. Of the held flights, 10 since departed.
By origin
| Origin | Scope | Now | Held | Avg | Longest |
|---|---|---|---|---|---|
| PHL Philadelphia | In scope | 3 | 3 | 1 hr 1 min | 1 hr 40 min |
| LGA New York | In scope | 1 | 2 | 54 min | 1 hr 3 min |
| BWI Baltimore | In scope | 1 | 1 | 1 hr 4 min | 1 hr 4 min |
| ROC Rochester | In scope | 1 | 1 | 2 hr 49 min | 2 hr 49 min |
| JFK New York | In scope | — | 1 | 1 hr 44 min | 1 hr 44 min |
| RDU Morrisville | In scope | — | 1 | 1 hr 17 min | 1 hr 17 min |
| ORD Chicago | Outside | 2 | 2 | 38 min | 41 min |
| MDW Chicago | Outside | 1 | 2 | 1 hr 29 min | 2 hr 8 min |
| CLT Charlotte | Outside | 1 | 1 | 17 min | 17 min |
| DFW DFW Airport | Outside | 1 | 1 | 43 min | 43 min |
| IND Indianapolis | Outside | 1 | 1 | 2 hr 44 min | 2 hr 44 min |
| MSY New Orleans | Outside | 1 | 1 | 26 min | 26 min |
| PSM | Outside | 1 | 1 | 26 min | 26 min |
| TPA Tampa | Outside | 1 | 1 | 49 min | 49 min |
| BNA Nashville | Outside | — | 1 | 46 min | 46 min |
By airline
| Airline | Now | Held | Avg | Longest |
|---|---|---|---|---|
| American Airlines AA | 5 | 7 | 57 min | 1 hr 44 min |
| Republic Airways YX | 4 | 6 | 1 hr 30 min | 2 hr 49 min |
| Delta Air Lines DL | 2 | 4 | 34 min | 49 min |
| EJA EJA | 2 | 2 | 1 hr 17 min | 2 hr 8 min |
| JetBlue B6 | 1 | 4 | 1 hr 35 min | 2 hr 52 min |
| Southwest Airlines WN | 1 | 3 | 53 min | 1 hr 4 min |
| VJA VJA | — | 1 | 44 min | 44 min |
Inbound in the air and diversions
Flights to BOS that had departed and not yet landed, at each arrivals board sample while the stop is in effect, and inbound flights that landed somewhere else instead.
- In the air now
- 93
- Peak in the air
- 94
- Diverted
- 0
In the air to BOS
In the air now (Oct 21, 8:44 PM EDT), by airline
- JetBlue B627
- Delta Air Lines DL17
- Republic Airways YX14
- American Airlines AA11
- United Airlines UA10
- Southwest Airlines WN4
- Air Canada AC1
- Alaska Airlines AS1
Diversions
No inbound flight has been seen diverting so far.
Impact by region
Arrivals by the air traffic control center they departed from. Held: departures from that center were stopped.
| Center | Status | Arrivals | Delayed | Cancelled |
|---|---|---|---|---|
| Washington Center (ZDC) | Held | 12 | 10 | 0 |
| New York Center (ZNY) | Held | 6 | 6 | 0 |
| Cleveland Center (ZOB) | Held | 5 | 5 | 0 |
| Boston Center (ZBW) | Held | 0 | 0 | 0 |
| Outside the US centers | Not held | 17 | 8 | 1 |
| Indianapolis Center (ZID) | Not held | 7 | 5 | 0 |
| Chicago Center (ZAU) | Not held | 6 | 5 | 0 |
| Atlanta Center (ZTL) | Not held | 5 | 4 | 0 |
| Houston Center (ZHU) | Not held | 4 | 4 | 0 |
| Los Angeles Center (ZLA) | Not held | 6 | 3 | 0 |
| Denver Center (ZDV) | Not held | 3 | 2 | 0 |
| Memphis Center (ZME) | Not held | 2 | 2 | 0 |
| Oakland Center (ZOA) | Not held | 4 | 1 | 0 |
| Fort Worth Center (ZFW) | Not held | 2 | 1 | 0 |
| Miami Center (ZMA) | Not held | 2 | 1 | 0 |
| Albuquerque Center (ZAB) | Not held | 1 | 1 | 0 |
| Jacksonville Center (ZJX) | Not held | 1 | 1 | 0 |
| Kansas City Center (ZKC) | Not held | 1 | 1 | 0 |
| Seattle Center (ZSE) | Not held | 1 | 1 | 0 |
Aircraft at the airport
Peak 33 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.
Ground stop issued at BOS for runway construction, until 8:00 pm EDT. Departures held from ZAU, ZTL, ZDC, ZNY and 5 more.
Extended until 9:00 pm EDT.
Chance of extension now medium.
Scope narrowed: departures from ZAU, ZTL, ZJX, ZID and 1 more released.
New advisory issued.
Read the advisory ↗Ground stop ended after 1 hr 47 min.
Advisories
The air traffic control advisories issued for this ground stop, as published.
ATCSCC ADVZY 079 BOS/ZBW 10/21/2026 CDM GROUND STOP
CTL ELEMENT: BOS ELEMENT TYPE: APT ADL TIME: 2346Z GROUND STOP PERIOD: 21/2336Z - 22/0100Z CUMULATIVE PROGRAM PERIOD: 21/1700Z - 22/0359Z DEP FACILITIES INCLUDED: (1stTier+CZY_AP) ZDC ZNY ZOB ZBW CYHZ CYOW CYUL CYYZ CYTZ CYQB PREVIOUS TOTAL, MAXIMUM, AVERAGE DELAYS: 2117 / 432 / 92 NEW TOTAL, MAXIMUM, AVERAGE DELAYS: 2963 / 442 / 129 PROBABILITY OF EXTENSION: MEDIUM IMPACTING CONDITION: RWY-TAXI / CONSTRUCTION COMMENTS: REDUCED SCOPE.Original advisory ↗
ATCSCC ADVZY 075 BOS/ZBW 10/21/2026 CDM GROUND STOP
CTL ELEMENT: BOS ELEMENT TYPE: APT ADL TIME: 2309Z GROUND STOP PERIOD: 21/2249Z - 22/0000Z CUMULATIVE PROGRAM PERIOD: 21/1700Z - 22/0359Z DEP FACILITIES INCLUDED: (Manual) ZAU ZTL ZDC ZNY ZJX ZOB ZBW ZID ZMP PREVIOUS TOTAL, MAXIMUM, AVERAGE DELAYS: 1302 / 172 / 65 NEW TOTAL, MAXIMUM, AVERAGE DELAYS: 1743 / 239 / 87 PROBABILITY OF EXTENSION: LOW IMPACTING CONDITION: RWY-TAXI / CONSTRUCTION COMMENTS: STOP NOT EXPECTED TO EXTEND.Original advisory ↗