Delta Air Lines had to suspend hot meal service on more than 200 flights out of its Detroit Metropolitan Wayne County Airport hub over the past several days because of a “food safety issue.”

Delta said that operations from the facility were shut down and hot food will be managed by other kitchens.

“During a recent inspection at a DTW kitchen, Delta’s catering partner was notified of a food safety issue within the facility,” Delta said in a statement on Sunday. “Delta and its catering partner immediately shut down hot food production and subsequently suspended all activity from the facility. Hot food and other onboard provisioning will be managed from other facilities.”

A message to a flight crew on Friday said first-class meals couldn’t be loaded because of “an unforeseen supply chain issue” and that the flight would be stocked with additional snacks.

The Food and Drug Administration did not immediately respond to requests for comment on Sunday.

The carrier said no employee or customer illnesses were reported, and that it gave affected customers travel vouchers or frequent flyer miles as compensation.

Airlines serve thousands of meals to passengers a day, generally through third-party catering kitchens. Do & Co., which works with Delta, didn’t immediately comment.

In July, a Detroit-to-Amsterdam Delta flight diverted to New York because of a report of spoiled chicken, forcing the carrier to limit meals to pasta for several days on certain flights.

Summer trips to Europe are getting too hot for thousands of tourists.

Delta Air Lines President Glen Hauenstein said travelers are opting out of flying to Europe during the traditional summer peak travel season. Instead, they are shifting trips to cooler months, a trend that airline officials have been noticing over the past couple of years as consumers look to escape crowds and record heat of popular destinations.

“The weather in Europe in August is really hot, and that people who have choices when they can take their vacations are moving into let’s call it more temperate months,” Hauenstein said Thursday on an earnings call. Corporate [travel] we haven’t seen much change year over year but it’s continuing to shift travel to Europe in particular from July and August peak to a September and October peak.”

Summer this year in the Northern Hemisphere was the hottest on record, according to the European Union’s climate monitor.

Airlines have been extending robust trans-Atlantic schedules through much of the fall to cater to the shifting patterns.

“What we’re doing at United is we’re extending the season,” Patrick Quayle, United Airlines‘ senior vice president of global network planning and alliances, said in an interview earlier this year.

He said the carrier opted to begin some European routes in March and April this year and will fly some of them through late October and early November. “What we’re seeing is, more and more, travelers are going in those shoulder seasons where you can get a bit more value, and I think the weather’s a bit better,” he added.

Southwest Airlines is planning to reduce service to and from Atlanta next year, cutting more than 300 pilot and flight attendant positions, according to a company memo seen by CNBC.

The changes come a day before Southwest’s investor day, when executives will map out the company’s plan to cut costs and grow revenue as pressure mounts from activist investor Elliott Investment Management.

Southwest told staff it isn’t closing its crew base in Atlanta. Instead, it will reduce staffing by as many as 200 flight attendants and as many as 140 pilots, for the April 2025 bid month.

The airline also isn’t laying the crews off, but they will likely have to bid to work from other cities.

Southwest will reduce its Atlanta presence to 11 gates next year from 18, according to a separate memo from the pilots’ union.

It will service 21 cities from Atlanta starting next April, down from 37 in March, the carrier said.

“Although we try everything we can before making difficult decisions like this one, we simply cannot afford continued losses and must make this change to help restore our profitability,” Southwest said in its memo. “This decision in no way reflects our Employees’ performance, and we’re proud of the Hospitality and the efforts they have made and will continue to make with our Customers in ATL.”

The unions that represent Southwest’s pilot and flight attendants railed against the airline for the staffing and service cuts.

“Southwest Airlines management is failing Employees while impacting Customers. Management continues to make decisions that lack full transparency, sufficient communication with Union leadership, and most alarmingly, a lack of focus on what has made the airline great, the Employees,” said Bill Bernal, the flight attendants’ union president.

A Southwest spokesman confirmed the changes and said the carrier will “continue to optimize our network to meet customer demand, best utilize our fleet, and maximize revenue opportunities.”

The airline had already pulled out of certain airports, some of which it experimented with during the pandemic to focus on more profitable service.

Southwest is not only facing changing booking patterns and oversupplied parts of the U.S. market but aircraft delays from Boeing, whose yet-to-be-certified 737 Max 7 airplanes are years behind schedule

The airline’s COO, Andrew Watterson, told staff last week that it will have to make “difficult decisions” to boost profits.

The reduction in Atlanta, the world’s busiest airport and Delta Air Lines home hub, is the latest development for the airline. In July, Southwest announced it plans to get rid of open seating and offer extra legroom on its airplanes, the biggest changes in its more than half-century of flying.

Also on Wednesday, Southwest released an expanded schedule, selling tickets through June 4. In addition to the planned cuts in Atlanta, the carrier said it will boost service to and from Nashville, Tennessee. It will also start offering overnight flights from Hawaii, beginning April 8. Those include service from Honolulu to Las Vegas and Phoenix; Kona, Hawaii, to Las Vegas; and Maui, Hawaii, to Las Vegas and Phoenix.