A Delta Air Lines A330 bound for Boston was forced to make an emergency return to London Heathrow shortly after takeoff on October 5, 2025, when fumes filled the cockpit during ascent. The aircraft, carrying 259 passengers, landed safely with emergency crews standing by. The incident occurred amid Delta’s ongoing replacement of Auxiliary Power Units (APUs) across its Airbus fleet to prevent “contaminated air” events. The affected A330, only 4.5 years old, is now undergoing inspection to identify the cause of the issue.
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