If you fly through Boston Logan from late August into fall 2026, build extra connection buffer now, because Massport will close Runway 9-27 for about 75 days starting August 31 for the next phase of runway safety work, with reduced airport capacity and a higher delay risk in weather.
A Massport newsroom release dated August 6, 2026 says Phase 2 continues Engineered Material Arresting System installation at the end of Runway 27, building on work completed last fall, with completion expected before Thanksgiving. Local reporting from NBC Boston and WCVB carries the same August 31 start and roughly 75-day window.
The traveler decision is operational: tighten plans around minimum connects at BOS, prefer earlier flights when you can, and recheck airline and Massport notices as August 31 approaches rather than assuming summer runway patterns still apply.
- What: Phase 2 runway safety work closes Runway 9-27 at Boston Logan.
- Start: About 75 days of closure with very limited availability from August 31, 2026.
- Project: Engineered Material Arresting System install at the end of Runway 27.
- Capacity: Reduced runway capacity; nearby communities may see more overflights.
- Traveler risk: Delays more likely in weather, traffic constraints, or other disruptions.
What Massport is building and why the runway must close
EMAS is a bed of crushable material designed to stop an aircraft that overruns a runway when there is not enough clear land beyond the pavement. Logan sits against water on several approaches, so those beds matter more than at inland airports with long clear zones.
Massport says Phase 2 continues the Runway 27 EMAS installation after Phase 1 work last fall. A deck supporting the EMAS will be built partly over the water. The release stresses that the work does not extend the runway length itself.
Runway 9-27 has to close, with only very limited availability, for about 75 days so crews can finish that work. Massport has coordinated the schedule with airline partners and the FAA. Construction noise such as pile driving may be audible in nearby communities during approved daytime hours.
Logan already operates EMAS at the ends of Runway 22R and Runway 33L, and Worcester Regional Airport also uses EMAS on Runway 11-29. The current project is therefore a completion step on a known safety program, not a brand-new concept for the Massachusetts system.
How capacity loss shows up for passengers
Fewer available runways means fewer simultaneous arrivals and departures. In clear weather with light demand, travelers may only notice a longer taxi or a modest gate hold. In low ceilings, strong winds, or peak banks, the same capacity cut can cascade into ground delay programs and missed connections.
Massport warns that surrounding communities may see more flights on the remaining runways while 9-27 is down. That community noise detail is a side effect of the airfield geometry change, not a separate construction event. Passengers should still treat it as confirmation that other runways will carry more of the load.
If you connect through BOS, add time on both sides of the bank. A 45-minute legal connection that works on a four-runway day can fail when a single bank is compressed. International arrivals with customs processing need even more slack because recheck lines do not shrink when airside capacity does.
Domestic origin travelers flying into Boston for the city should still plan ground transport normally, but build a later downtown meeting or hotel check-in window. Deep Arrival’s Boston things to do guide remains useful once you are free of the airport day, not while you are still absorbing a delay.
What to do before August 31 and through the fall window
First, audit any BOS itinerary between late August and Thanksgiving. If you have a same-day outbound after a short inbound, move the connection earlier or rebook a longer bank while inventory remains flexible.
Second, turn on airline app alerts for schedule changes. Capacity-driven delays often appear as revised departure times rather than cancellations. Keep one backup flight option in mind for critical meetings or cruise embarkations out of Boston.
Third, if you control meeting schedules in Boston, avoid hard starts within two hours of a tight arrival during the closure window. Weather on top of reduced runway count is the high-risk combination Massport flags explicitly.
Fourth, do not invent your own closure end date. Massport says work is expected before Thanksgiving, not a single calendar day. Recheck the Massport newsroom and airline notices as fall progresses rather than treating the first press release as the final timetable.
Finally, separate this multi-week safety project from one-day weather ground delay stories. Day-of thunderstorm programs end with the weather. This runway program lasts for weeks and changes the baseline capacity every day it runs.
Airlines may thin some bank frequencies or retime flights as they model the reduced runway set. That can show up as seat map changes or equipment swaps even when the flight number survives. If your booking is critical, screenshot the original schedule and watch for reprotection emails in the two weeks before August 31.
Passengers with tight cruise embarkations from Boston, Cape Cod, or New England ports should treat BOS as a risk node, not a same-day certainty. Move ship embarkation arrivals to the prior evening when cabin inventory allows. The cost of one hotel night is usually lower than a missed embarkation after a multi-hour ground delay.
Business travelers with Logan as a mid-day hub should ask whether a same-day Boston meeting can move to a later block or a video call. Capacity reductions punish back-to-back city pairs more than end-point leisure trips with soft schedules.
| If you | What to do |
|---|---|
| Connect at BOS after Aug 31 | Lengthen the connection and avoid minimum legal banks during the 75-day window. |
| Have a same-day cruise or meeting | Arrive a day early or move the hard start later; weather plus capacity cuts stack risk. |
| Hold a late evening outbound | Prefer earlier departures when available; compressed banks can erase last-bank recoveries. |
| Live under alternate flight paths | Expect more overflights while other runways carry displaced traffic. |
| See only a summer schedule PDF | Recheck airline and Massport notices after Aug 31; baseline capacity has changed. |
- From Aug 31: Treat BOS as reduced-capacity for about 75 days of Runway 9-27 limits.
- Weather days: Expect higher delay odds when low ceilings or winds already constrain the field.
- Connections: Add buffer on domestic and international banks; do not rely on summer minimums.
- End state: Massport targets completion before Thanksgiving, not a single published reopen day yet.
- Why it exists: EMAS safety work at Runway 27, not a routine pavement mill-and-overlay.
Massport’s August 6, 2026 notice puts a concrete traveler clock on Boston Logan this fall: Runway 9-27 limited for roughly 75 days from August 31 while EMAS safety work finishes at Runway 27. Reduce connection risk now, watch airline revisions as the window opens, and keep rechecking official notices until the airport restores full runway availability before Thanksgiving.
When does the Logan Runway 9-27 closure start?
Massport says the runway will be closed with very limited availability for about 75 days beginning August 31, 2026.
Why is the runway closing?
Phase 2 of Engineered Material Arresting System installation at the end of Runway 27 requires the temporary capacity reduction.
Will flights be delayed?
Massport says travelers may experience delays, especially during weather, air traffic constraints, or other operational disruptions.
How long will the work last?
About 75 days of limited Runway 9-27 availability, with completion expected before Thanksgiving 2026.
Does this extend the runway into the water?
Massport says an EMAS support deck will be built partly over the water, but the work does not extend the runway length.
