More airlines around the world announced delayed or cancelled flights Saturday following an Airbus alert that up to 6,000 A320 aircraft may require upgrades.

Airbus instructed its clients Friday to take "immediate precautionary action" after evaluating a technical malfunction on board a JetBlue flight in October.

"Intense solar radiation may corrupt data critical to the functioning of flight controls," it said, adding that "a significant number of A320 Family aircraft currently in-service" may be affected.

Replacing the software will take "a few hours" on most planes but for some 1,000 aircraft, the process "will take weeks", a source close to the issue told AFP.

Air France told AFP it was calculating how many more flights would be cancelled Saturday.

"Customers affected by cancellati

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