A Jetblue Airbus A220-300 aircraft during the International Paris Air Show in June. Airbus ordered an immediate software change after passengers were hurt following a sharp loss of altitude on a Jetblue flight, according to industry sources.

Europe’s Airbus EADSY said on Friday it was ordering an immediate software change on a “significant number” of its best-selling A320 family of jets in a move that industry sources said would bring disruption to half the global fleet, or thousands of jets.

The move must be carried out before the next routine flight, according to a separate bulletin to airlines seen by Reuters, threatening cancellations or delays during one of the busiest travel weekends of the year in the United States and beyond.

Airbus said in a statement a recent incident involv

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