Fears of days of travel chaos across Europe and the world eased on Saturday after plane manufacturer Airbus intervened rapidly to implement a software upgrade it had said was immediately needed on some 6,000 of its stalwart A320 planes.

The announcement by Europe’s top plane manufacturer late Friday that the planes could not fly again until the switch was made followed an incident in the United States and raised concerns that hundreds of planes would need to be grounded for long periods.

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But several leading European airlines said there had been minimal or no cancellations as a result, although there were indications the situation was more problematic in Latin America and Asia.

Airbus instructed its clients Friday to take “immediate precautionary action” after evaluat

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