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Delta Air Lines is replacing certain engines on more than 300 of its Airbus planes after toxic fume incidents contaminated cabin air and sickened crew members and passengers, according to reports.

The airline has been swapping out auxiliary power units (APUs) — small engines that are located in the back of planes — since 2022, The Wall Street Journal reported Thursday.

The units supply electricity and cabin air when the main engines aren’t running and do not provide propulsion for flight. Delta says the work on its A320 jets is now about 90% complete.

AIRLINES TOLD TO REEVALUATE EMERGENCY EVACUATION PROCEDURES AFTER CARRY-ON CONCERNS

Faulty APUs can leak oil into the plane’s airflow system, allowing toxic fumes and odor

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