Cases of toxic fumes in plane cabins growing

Safety Concerns - American Airlines Airbus A321 experienced mid-air turnaround and emergency landing due to fumes in the cabin and cockpit [1] - Passengers and crew reported experiencing noxious fumes, described as having a "dirty feet smell" [2] - Past incidents have involved flight attendants and pilots reporting headaches, dizziness, and suspected brain injuries [2] - The likely cause is oil or hydraulic fluid leaking into the plane's bleed air system [2] Industry Response - A Wall Street Journal investigation found more cases involving the Airbus A320 [3] - Delta is replacing the auxiliary power units on all of its Airbus A320s [4] - Airbus states its aircraft are designed and manufactured according to airworthiness requirements, and the FAA insists cabin air is safe [4] - Flight attendant and pilot unions are calling for sensors and engine filters to prevent toxic fumes from entering planes [4]