Europe’s Airbus said on Friday it was ordering an immediate software change on a “significant number” of its best-selling A320 family of jets in a move that industry sources said would bring disruption to half the global fleet, or thousands of jets.

The move must be carried out before the next routine flight, according to a separate bulletin to airlines seen by Reuters, threatening cancellations or delays during one of the busiest travel weekends of the year in the United States and beyond.

Airbus said in a statement a recent incident involving an A320-family aircraft had revealed that intense solar radiation may corrupt data critical to the functioning of flight controls.

“Airbus acknowledges these recommendations will lead to operational disruptions to passengers and customers,” i

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