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On July 23, there were 8,093 flight delays across the United States, affecting some of the biggest hubs. The Federal Aviation Administration issued a warning earlier in the day about “slower flights” due to weather likely to increase delays.

U.S. Airports With The Most Departure Delays On July 23

The FAA issued several advisories this week, including advisories at 10 different East Coast airports, along with multiple stoppages at Boston Logan International Airport, leading the hub to cancel the most flights in America.

As of early morning on July 24, the disruptions have stabilized compared to the day prior. American Airlines leads the way among U.S. carriers in cancelled flights for July 24, with nine so far. Disruption numbers are expected to increase throughout the day, during a busy week of delays and cancellations.

The FAA Issued Thunderstorm And Low Cloud Advisories For 10 Different U.S. Airports

Although cancellations were much lower than previous days, delay totals remained high on July 23 across the U.S. In its daily air traffic report, the FAA issued several warnings on July 23 for multiple hubs, including some of the busiest airports in the U.S., Atlanta Hartsfield-Jackson International Airport and Denver International Airport.

U.S. Airports Listed Under The FAA’s July 23 Advisory

According to FlightAware data, Charlotte Douglas International Airport was hit the hardest by the weather disruptions, delaying nearly half of its departures (380, totaling 44% of its overall volume). Arrival delays were also high at CLT, with 296 flights affected.

Due to low clouds and congestion, San Francisco International Airport faced disruptions of its own, with the most delays on arriving flights. SFO delayed more than half of its arrivals, at 51%. The hub had the most delays among all U.S. airports for arriving flights on Thursday. Consistency issues have been troubling at SFO throughout the summer.

Given the increase in delays, passengers reported several issues nationwide.

Travelers Reported Issues At Charlotte Douglas International Airport And Denver International Airport

Shane Akers was one of the many travelers who faced issues with American Airlines on Thursday. According to the AA customer, their flight at Charlotte Douglas International Airport was delayed, with no clarity on what was going on.

“@AmericanAir why board a plane at 10:50 to have everyone wait for an inbound pilot. You delayed after boarding, made an announcement that they were in the terminal and on the way. Still not here,” he wrote on X.

Traveler Shea Sullivan kept the message short on X, facing more disruptions at Denver International Airport.

“There is literally nothing easy about the Denver Airport.”

Other passengers like Mike Streich continued to experience issues at Houston’s George Bush Intercontinental Airport. Streich stated on X that his flight was delayed by more than three hours due to maintenance issues.

“@AmericanAir worst travel experience by far—and I haven’t even gotten on a plane yet. My first flight is now 3 hrs 20 min delayed for maintenance, which caused me to miss my connection. I’m rebooked with a 6+ hr layover and will now arrive 8 hrs late, after midnight. The rental car desk closes 5 min after I land, so I’ll likely have to go back for my car tomorrow. Tried to buy Admirals Club passes for the day, but your system was down.”

Not only was it a tough day of travel for major U.S. airports, but the same held true for the major U.S. airlines, including American Airlines and Southwest Airlines.

How The Major U.S. Airlines Were Impacted By The Flight Disruptions

Both Southwest Airlines and American Airlines were most impacted by the delays. Southwest Airlines has a high volume of flights out of DEN, while American Airlines is the dominant carrier at CLT and its major hub, Dallas-Fort Worth International Airport. The two airlines had the most delays worldwide.

United’s delays were also higher than usual due to the SFO disruptions and high delays at DEN.

Airlines With The Most Delays On July 23

Regarding cancelled flights, JetBlue was at the very top of the list again. The carrier had 56 cancellations and 493 delays, affecting 45% of its total flight volume. The carrier had a difficult week of cancellations, dealing with internal issues caused by weather disruptions.

Heading into the weekend, JetBlue and the other major U.S. carriers will aim to get back on track following several FAA advisories and stoppages throughout the week.