The recent wave of flight cancellations stems from an extensive recall of thousands of Airbus aircraft, which require urgent maintenance following a problem that led to passenger injuries and an emergency landing last month.

This issue has particularly disrupted Jetstar’s operations, as the airline relies heavily on the Airbus A320 for its services across Australia and New Zealand.

Jetstar informed 9News that while it anticipates the majority of its aircraft to return to regular service today, the ripple effects of the disruption are still being felt.

“There might be some residual delays or cancellations on Sunday as the network fully stabilizes. We will reach out to customers via SMS and email if there are any further disruptions,” an airline spokesperson stated.

Airbus has identified that severe solar storms, such as solar flares, have the potential to disrupt the control systems of the Airbus A320 series, which includes the A319, A320, and A321 models.

About 6000 of the single-aisle planes worldwide, which are the bestselling passenger aircraft in the world, need the repairs, but disruption so far has been minimal.

“Analysis of a recent event involving an A320 Family aircraft has revealed that intense solar radiation may corrupt data critical to the functioning of flight controls,” Airbus said in a statement.

On October 30, JetBlue Flight 1230 — an A320 — was flying from Cancun, Mexico, to Newark, New Jersey, when it suddenly dove down in altitude. The pilots made an emergency landing in Tampa, Florida, where about 15 people were taken to a hospital.

Airbus investigated the incident and on Friday told airlines in an “Alert Operators Transmission” that the fix was needed.

The company believes it is the only time this specific problem has happened, but says it “proactively worked with aviation authorities … keeping safety as our number one and overriding priority.”

Most planes can be repaired in about two hours by simply reverting to the previous software, Airbus told CNN on Saturday, meaning that disruption seems relatively limited despite it being one of the busiest travel weekends for Americans celebrating Thanksgiving.

However, for about 900 of the older aircraft affected, the fix is more complicated since they will need to have new hardware manually installed.

The Airbus A320 series has what’s called fly-by-wire controls: physical movements from the pilot run through computers which, in turn, adjust the plane’s control surfaces.

An airworthiness directive from the European Union requires airlines to make the repairs before the planes can carry passengers again.

The airlines’ scrambled repairs seemed to avoid any widespread disruption by Saturday morning. Arrivals boards at major airport hubs like Dallas Fort Worth, Dubai, Hartsfield-Jackson Atlanta, Tokyo Haneda and London Heathrow indicated that most flights were running on time, or with short delays.

American Airlines had completed all except four of the 209 aircraft that needed to be updated by Saturday morning, less than the 340 it had earlier predicted, according to a statement from the airline.

American initially warned of “some delays” as a result of the work, but it said on Saturday it expected no further operational impact. It hopes to have all of the repairs made by Sunday.

Delta Air Lines said fewer than 50 of its A321neo aircraft will be impacted and the work should be complete by Saturday morning.

“As safety comes before everything else, Delta will fully comply with a directive and expects any resulting operational impact to be limited,” the airline said in a statement.

Six planes in United Airlines’ fleet are affected and there will be “minor disruption to a few flights,” the carrier said.

JetBlue, which operates a fleet mostly made up of A320 and A321 aircraft, did not say how many of their planes needed to be fixed, but told CNN in a statement it has already started repairs.

“Our teams are doing everything possible to minimise disruptions to customers as this work is completed,” JetBlue said. “We will notify customers of any flight changes and customers can always check their flight status on jetblue.com or on the JetBlue app.”

Airbus and the European Aviation Safety Authority have told airlines to reverse the upgrade before letting affected planes fly again, Simes said.

In Europe, Lufthansa, Aer Lingus, Wizz Air, EasyJet and British Airways all said some of their aircraft were affected but downplayed the effect of that on their operations.

Meanwhile, the papal plane — known as “Shepherd One” — was also affected by the issue, though the Vatican said the necessary updates were carried out on Saturday afternoon, so Pope Leo’s trip to Turkey and Lebanon will proceed with the same plane.