Dozens of airlines said they had carried out snap software retrofits ordered by Airbus after a vulnerability to solar flares emerged.

The update comes days after Airbus on Friday announced that affected planes could not fly until a critical software update, with the issue coming to flight following an incident in the United States that highlighted a risk to the A320 family of aircraft.

Airbus issued an urgent directive on a “significant number" of A320 family aircraft, potentially disrupting travel. Here’s what we know.

Airbus ordered a sweeping recall for thousands of aircraft on Friday — sparked widespread alarm about a global flight disruption amid the festive season. Immediate repairs have been ordered before 6,000 of its widely used A320 family of jets can fly again.

The change must be carried out before the next routine flight, and is among the largest mass recalls affecting Airbus.

TOKYO/NEW DELHI/PARIS - Global airlines scrambled to fix a software glitch on Airbus A320 jets on Nov 29 as a partial recall by the European planemaker halted hundreds of flights in Asia and Europe and threatened US travel over the busiest weekend of the year.

How the JetBlue A320 triggered fleet-wide checks demonstrated the fragility and the resilience of today’s software-driven aviation systems . The hidden fragility of modern aviation revealed by a single A320: The Airbus weekend crisis .

Recall by European planemaker temporarily grounds aircraft in Asia and Europe; October incident triggered recall, sources say.