(NewsNation) — Delta Air Lines will replace power units on more than 300 Airbus jets following reports that toxic fumes have contaminated cabin air, posing health and safety risks to passengers and crew, according to a recent Wall Street Journal investigation.

Keith Mackey, a retired airline captain and aviation accident and reconstruction consultant, told "Morning in America" on Friday that the issue has persisted for roughly two decades and primarily affects Airbus A320 aircraft.

"The toxic fumes are apparently coming from an oil leak or external leak in the auxiliary power unit," he explained. "This isn't used to power the airplane in flight, but it is used to supply air conditioning or heating on the ground or in flight if needed."

Delta initiated a replacement program in 2022 and i

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