Boston's ground delay program averages 1 hour 46 minutes as the Northeast storm wall clears, with Denver the next risk at 3 PM

The noon Wednesday update: the two-day Northeast storm wall has fully cleared with JFK, Newark, LaGuardia, Philadelphia, and the DC airports all on time, but Boston Logan is under a ground delay program averaging 1 hour 46 minutes for low ceilings through 11:59 PM ET, San Francisco's fog ground delay program is running 41 minutes (the 11 AM forecast the morning issue flagged), Denver is PROBABLE for a ground stop or delay program at 3 PM ET from wind and showers, Delta just posted an Atlanta thunderstorm waiver as Georgia and Florida carry the day's only severe risk, and American Airlines' IT outage is now being called the third such failure in two years.

Boston is today's worst airport

The system that hammered the Northeast for two straight days has moved out, and the disruption it leaves behind has settled over Boston. The FAA's airport status page for Logan, updated at 12:16 PM ET, shows a ground delay program in effect for weather and low ceilings, with arriving flights delayed an average of 1 hour and 46 minutes. Departure traffic headed to Boston is seeing the same 1h46m average. Airborne arrival delays are holding at 15 minutes or less, meaning the pain is concentrated on the ground at your origin airport, not in holding patterns over New England.

The cause is low ceilings and wind, not thunderstorms. The FAA's operations plan advisory (ADVZY 101, signed 11:44 AM ET) notes Boston is operating a runway 04 configuration and warns that if the wind pushes further southeast or gusts increase, Logan could switch to a runway 15R operation, which would lower the arrival rate and force a program revision. In plain terms: the 1h46m could get worse if the wind shifts. The program is set through 11:59 PM ET (0359Z).

Boston was already bruised from Tuesday. The Boston Globe reported more than 200 Logan cancellations and over 400 delays on Tuesday evening, with Republic, JetBlue, and Delta among the hardest hit. Today's low-visibility program layers on top of that recovery.

San Francisco's fog forecast came true

The morning issue flagged San Francisco as PROBABLE for a ground delay program at 11 AM ET, and it verified. FlightCheck's live FAA feed (last checked 12:11 PM ET) shows SFO under a ground delay program for low visibility averaging 41 minutes, and the FAA advisory runs that program through 6:59 PM ET (2259Z). This is the chronic marine-layer fog that recurs at SFO all summer, not a one-off storm.

The FAA is already planning a second SFO ground delay program, marked PROBABLE after 10 PM ET (0200Z), so evening California travelers should expect the metering to resume after a possible afternoon gap. San Francisco logged 8 cancellations and 22 delays so far today per FlightAware, modest numbers that confirm this is a flow-control issue rather than a cancellation event.

The Northeast storm wall is over

After five straight issues tracking ground stops and delay programs across New York, Newark, Philadelphia, and the DC metro, the live data shows a clean slate. FlightCheck reports JFK, Newark, LaGuardia, Philadelphia, Reagan National, Dulles, and Baltimore all on time as of 12:11 PM ET. Charlotte, Denver, Miami, Orlando, Atlanta, Chicago O'Hare, and Dallas/Fort Worth are also on time.

The FAA advisory still carries a New York Center (ZNY) TMU staffing trigger until 1 PM ET (1700Z), and it lists Newark as POSSIBLE for a ground stop or delay program after 1 PM ET. So the Northeast is recovered but not fully out of the watch window. The forecast thunderstorms that drove Tuesday's wall did not re-fire this morning, and the Storm Prediction Center has removed the Northeast and Mid-Atlantic from today's severe risk entirely.

A note on the data: some third-party trackers were still displaying yesterday's New York ground stops this morning. The FAA's own NASSTATUS feed, reflected in FlightCheck and the advisory, is the authoritative source, and it shows no active New York-area programs.

Denver and Atlanta lead the afternoon watch

With the Northeast quiet, the focus shifts west and south. The FAA marks Denver PROBABLE for a ground stop or delay program after 3 PM ET (1900Z), driven by wind and light rain (coded SHRA/WIND in the advisory) rather than severe convection. Denver is also the largest hub most exposed to that Plains weather today. The advisory has added ZFW and ZHU (the Dallas and Houston centers) to the plan for possible arrival-route restructuring as convective activity builds along the Plains and Lower Mississippi Valley this afternoon.

Atlanta is the new addition. Delta posted an Atlanta Summer Thunderstorms advisory at 12:08 PM ET today, and the FAA lists Atlanta under VCTS (vicinity thunderstorms) terminal constraints with en route CDRs, SWAP, and arrival routes POSSIBLE after 2 PM ET (1800Z). The SPC's Day 1 outlook, updated at 12:01 PM ET, puts a Slight Risk of severe thunderstorms over southern Georgia and northern Florida this afternoon, with damaging wind gusts the main threat. There is no SPC severe risk over the Northeast, Mid-Atlantic, or Colorado today, which is why the Northeast stayed clear this morning and why Denver's risk is wind-driven rather than storm-driven.

Orlando and Tampa remain POSSIBLE for ground stops through 8 PM ET, and Reagan National is POSSIBLE for a ground stop or delay program through 8 PM ET. The next FAA planning webinar is at 1:15 PM ET (1715Z), which could sharpen the Denver and Atlanta windows.

American's IT outage is now the third in two years

Coverage of Tuesday evening's American Airlines ground stop has sharpened overnight into a pattern story. Simple Flying reports the FAA issued the nationwide ground stop at 6:29 PM ET Tuesday at American's own request, lifted it at 7:18 PM ET, and that American confirmed a 45-minute total duration. Per FlightAware data cited by Simple Flying, American logged 1,387 delays (38 percent of mainline) and 341 cancellations (9 percent of mainline) on Tuesday, though those full-day figures cannot be separated from the East Coast weather that was already disrupting operations.

View From The Wing documented the operational freeze in detail: boarding passes would not load, gate agents could not check in or rebook passengers, baggage and gate systems went down, and aircraft could not obtain flight plans or push back. The outage hit in the gap between Northeast storm waves, turning recoverable weather delays into missed takeoff windows.

The new framing comes from TechTimes, which calls this the third time in under two years that a connectivity-layer failure has grounded American's entire network, after Christmas Eve 2024 and June 2025. The article argues the repetition is structural: a shared connectivity layer that dispatch, weight-and-balance, crew scheduling, gate management, and the passenger apps all depend on, with no isolation between infrastructure and flight-release functions. American has not named the failed system or vendor, has not suggested a cybersecurity cause, and has not committed to a remediation timeline. TechTimes also raises the question of whether the DOT will classify the outage as a "controllable" event, as it did with Delta's 2024 CrowdStrike disruption, which would put rebooking and compensation obligations on the airline. The DOT has not announced an investigation.

Airways Magazine confirmed that even after the nationwide stop lifted, Charlotte Douglas and Miami remained under separate American-specific ground stops classified as carrier requests, as the airline worked through backlogs compounded by the regional thunderstorms. American was still leading worldwide cancellations on Wednesday morning with 88 of 407 US cancellations at the 6 AM count.

Waivers and rebooking

Delta's advisories page, checked at 12:13 PM ET, shows three active weather waivers. The New York City Summer Weather advisory (EWR, HPN, JFK, LGA) and the Mid-Atlantic Weather advisory (ABE, BOS, BWI, DCA, IAD, PHL) remain listed, both last updated July 28, with rebooking windows that the midnight update verified cover travel through today, July 29, with rebook dates into August 1. The new Atlanta Summer Thunderstorms advisory posted today covers the Atlanta area. Check Delta's specific advisory pages for the exact ticketing and rebooking deadlines.

JetBlue had a waiver covering the New York metro airports (ISP, JFK, LGA, EWR, HPN) for July 27 through 29 with rebooking into August 1, meaning today is the last covered travel day. American's IT-outage-specific waiver (travel July 28, rebook July 27 through 30, changes by July 28) has expired. American's general travel alerts page is the place to check for any residual recovery flexibility. United's page was not independently verified this run, so check directly at united.com.

If your flight is significantly delayed or canceled, the DOT's airline customer service dashboard spells out each carrier's commitments on refunds and amenities. An IT outage in the airline's own systems, as opposed to weather, is generally treated as a controllable disruption, which strengthens your case for rebooking without fees and, for long waits, meal vouchers.

The bottom line

The Northeast's two-day storm siege is done, and Boston's low ceilings are the main thing slowing the system right now. If you are flying into Boston today, expect close to two hours of ground delay at your origin, and watch for a possible worsening if Logan's wind shifts runways. San Francisco travelers should budget for 40-minute fog delays through the evening. The next decision point is 3 PM ET, when Denver's wind-driven ground stop or delay program is most likely to fire, with Atlanta's thunderstorms building over Georgia and Florida at the same time. The FAA's 1:15 PM ET webinar will refine both windows. American's IT outage is no longer a live ground stop but its ripple, and the questions about why the same failure keeps happening, are still unfolding.