Airbus is recalling more than half of the jets in its global A320 fleet, which will disrupt thousands of flights around the world.

The company said the planes need an “immediate software change” to ensure flight control is sound.

The recall comes after a JetBlue plane’s nose dropped for several seconds without the pilot’s input during a flight in October, according to a European safety agency.

American Airlines says the news will disrupt more than 300 flights for its airline alone, while Air Canada says “very few” of its planes are affected.