Air passengers have been warned of potential travel disruptions following an Airbus alert on Friday that up to 6,000 operational A320 aircraft may require upgrades.

The European plane-maker instructed its clients to take "immediate precautionary action" after evaluating a technical malfunction onboard a JetBlue flight in October.

"Intense solar radiation may corrupt data critical to the functioning of flight controls," Airbus stated, 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.

The European Union Aviation Safety Agency (EASA) said in a statement Airbus had informed it about the

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