On September 24th, local time, reporters learned that Delta Air Lines is replacing power units on over 300 Airbus aircraft to address toxic gas leaks in the cabin air. Reports indicate that incidents of toxic fumes in commercial aircraft cabins have become increasingly frequent in recent years, and this hidden risk has caused brain damage to some passengers and crew members. The Federal Aviation Administration has recorded thousands of reports of toxic gas leaks since 2010, with the number of reports increasing sharply in recent years, particularly on Airbus A320 aircraft.