According to American Airlines, 340 aircraft would be impacted by the Airbus software issue

American Airlines said it expects some operational delays due to a major software update on a significant number of its Airbus A320 aircraft, adding that the issue affects about 340 of the airline’s planes.
The airline said it expects the vast majority of the changes to be completed “today or tomorrow” and that it is “intensely focused” on limiting cancellations.
Europe-based Airbus ordered an immediate software update on a significant number of its best-selling A320 family aircraft on Friday.
Additionally, a Wizz Air representative verified on Friday that a few of its aircraft were among those in need of an Airbus software update.
Wizz stated that some flights over the weekend might be impacted and that it had planned the necessary maintenance.
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