Airlines around the world reported short-term disruptions heading into the weekend as they fixed software on a widely used commercial aircraft, after an analysis found the computer code may have contributed to a sudden drop in the altitude of a JetBlue plane last month.

Airbus said Friday that an examination of the JetBlue incident revealed that intense solar radiation may corrupt data critical to the functioning of flight controls on the A320 family of aircraft.

The FAA joined the European Union Aviation Safety Agency in requiring airlines to address the issue with a new software update. More than 500 U.S.-registered aircraft will be impacted.

The EU safety agency said it may cause “short-term disruption” to flight schedules. The problem was introduced by a software update to the plane’s onboard computers, according to the agency.

Airbus CEO Guillaume Faury apologized to customers after the required fix led to “significant logistical challenges and delays.”

“Our teams are working around the clock to support our operators and ensure these updates are deployed as swiftly as possible to get planes back in the sky and resume normal operations, with the safety assurance you expect from Airbus,” he wrote in a message posted on LinkedIn on Saturday.

In Japan, All Nippon Airways, which operates more than 30 planes, canceled 65 domestic flights for Saturday. Additional cancellations on Sunday were possible, it said.

The software change comes as U.S. passengers were beginning to head home from the Thanksgiving holiday, which is the busiest travel time in the country.

American Airlines has about 480 planes from the A320 family, of which 209 are affected. The fix should take about two hours for many aircraft and updates should be completed for the overwhelming majority on Friday, the airline said.

On Saturday, the airline said in a statement that only four planes still needed to be updated and that it “expects no further operational impact.”

Air India said on X that its engineers were working on the fix and completed the reset on more 40% of aircraft that need it. There were no cancellations, it said.

Delta said it expected the issue to affect less than 50 of its A321neo aircraft. United said six planes in its fleet are affected and it expects minor disruptions to a few flights. Hawaiian Airlines said it was unaffected.

Pope Leo XIV is on his inaugural foreign trip, to Turkey and Lebanon, and is flying along with the papal delegation and press corps aboard an ITA Airways Airbus A320neo charter.

The Vatican spokesman, Matteo Bruni, said Saturday that ITA was working on the issue. He said the necessary component to update the aircraft was on its way to Istanbul along with the technician to install it. Leo was scheduled to fly from Istanbul, Turkey to Beirut, Lebanon on Sunday afternoon.

In France, Transport Minister Philippe Tabarot said the situation has stabilized as several software updates had already been installed. He told BFM-TV that the impact was limited in the country with an “almost complete return to normal in French airports.”

In the U.K., disruption also was minimal. British Airways, for example, said only three of its aircraft required the update, while EasyJet indicated there may be changes to its flying schedule as a result of the update, in which case passengers will be informed.

Germany’s Lufthansa said most software updates were completed during the night and on Saturday morning. No Lufthansa Group Airlines flights are expected to be canceled due to the current situation, but there may be minor delays over the weekend, it said.

Scandinavia’s SAS said its flights were operating as normal Saturday, after teams worked overnight to install the required software.

Mike Stengel, a partner with the aerospace industry management consulting firm AeroDynamic Advisory, said the fix could be addressed between flights or on overnight plane checks.

“Definitely not ideal for this to be happening on a very ubiquitous aircraft on a busy holiday weekend,” Stengel said from Ann Arbor, Michigan. “Although again the silver lining being that it only should take a few hours to update the software.”

At least 15 JetBlue passengers were injured and taken to the hospital after the Oct. 30 incident on board the flight from Cancun, Mexico, to Newark, New Jersey. The plane was diverted to Tampa, Florida.

Airbus, which is registered in the Netherlands but has its main headquarters in France, is one of the world’s biggest airplane manufacturers, alongside Boeing.

The A320 is the primary competitor to Boeing’s 737, Stengel said. Airbus updated its engine in the mid-2010s, and planes in this category are called A320neo, he said.

The A320 is the world’s bestselling single-aisle aircraft family, according to Airbus’ website.

Associated Press writers Mari Yamaguchi in Tokyo, Jennifer Kelleher in Honolulu, Geir Moulson in Berlin, Samuel Petrequin, Pan Pylas in London and Nicole Winfield in Istanbul contributed to this report.

WASHINGTON, Nov 29 (Reuters) – U.S. President Donald Trump said on Saturday the airspace above and surrounding Venezuela should be considered “closed in its entirety,” but gave no further details, stirring anxiety and confusion in Caracas as Washington ramps up pressure on President Nicolas Maduro’s government.

“To all Airlines, Pilots, Drug Dealers, and Human Traffickers, please consider THE AIRSPACE ABOVE AND SURROUNDING VENEZUELA TO BE CLOSED IN ITS ENTIRETY,” Trump said in a Truth Social post.

U.S. officials contacted by Reuters were surprised by Trump’s announcement and unaware of any ongoing U.S. military operations to enforce a closure of Venezuelan airspace. The Pentagon did not respond to requests for comment and the White House did not provide any further explanation.

In a statement Saturday afternoon, Venezuela’s government condemned Trump’s comments, describing them as a “colonialist threat” against the country’s sovereignty and incompatible with international law.

David Deptula, a retired lieutenant general who commanded a no-fly zone over northern Iraq in 1998 and 1999, said Trump’s announcement raises more questions than it answers. Imposing a no-fly zone over Venezuela could require significant resources and planning, depending on the goals of the airspace closure, he said.

“The devil’s in the details,” Deptula said.

The Trump administration has been weighing Venezuela-related options to combat what it has portrayed as Maduro’s role in supplying illegal drugs that have killed Americans. The socialist Venezuelan president has denied having any links to the illegal drug trade.

Reuters has reported that options under U.S. consideration included attempting to overthrow Maduro, and that the U.S. military is poised for a new phase of operations after a massive military buildup in the Caribbean and nearly three months of strikes on suspected drug boats off Venezuela’s coast. Trump has also authorized covert CIA operations in the South American country.

Maduro, in power since 2013, has contended that Trump is seeking to oust him and that Venezuelan citizens and the military will resist any such attempt.

Trump told military service members earlier this week that the U.S. would “very soon” begin land operations to stop suspected Venezuelan drug traffickers.

Caracas residents who spoke to Reuters criticized Trump’s announcement.

“I think it’s unfair because people need to travel to work, to do business, to see their family, and us Venezuelans aren’t at fault for these situations,” said Manuel Romero, who works as a cooking assistant.

Carmen Castillo, a lawyer, said she worried that many people who would have traveled to visit their families outside Venezuela for the holidays now won’t be able to do so.

“We’re confined, here in Caracas, in Venezuela, of course it affects us,” she said.

Maduro and high-ranking officials in his government, some combination of whom appear almost daily on state television, have decried U.S. imperialism in their recent comments, but do not single out Trump by name, as the Venezuelan government may be trying to de-escalate tensions, according to security and diplomatic sources. U.S. Secretary of State Marco Rubio had previously been the focus of Venezuelan government ire, but even references to him have decreased in recent weeks.

The U.S. boat bombings have led to stepped-up surveillance by authorities in the remote northeastern state of Sucre, with increased patrols by security agencies and ruling-party supporters stoking fear among locals, four residents and one recent visitor said.

GPS signals in Venezuela have also been affected in recent weeks amid the U.S. buildup.

Trump’s announcement on Venezuela’s airspace followed a warning last week from the U.S. Federal Aviation Administration that major airlines faced a “potentially hazardous situation” when flying over Venezuela due to a “worsening security situation and heightened military activity in or around” the country.

Venezuela revoked operating rights for six major international airlines that had suspended flights to the country after the FAA warning.

(Reporting by Mrinmay Dey in Bengaluru and Phil Stewart, Idrees Ali and Lucia Mutikani in Washington; Editing by Kirsten Donovan, Sergio Non, Alexander Smith and Paul Simao)