Concerns Grow Over Toxic Cabin Air for Airline Crew
Recent research indicates that pilots and flight attendants may be experiencing brain and nerve damage akin to that observed in NFL players.
Since 2010, airlines have submitted thousands of reports to the Federal Aviation Administration (FAA), highlighting incidents where toxic smoke has infiltrated cockpits and cabins. This contamination occurs due to a system that draws air from the engine and pushes it into the cabin without proper filtration.
The frequency of these cases has surged in recent years. Notably, Airbus’s A320 jets have been identified as a significant contributor to this increase.
In an incident involving a Delta flight to South Carolina, thick white smoke infiltrated the cabin through overhead vents, prompting an emergency landing in Atlanta as passengers struggled to breathe.
“Breathe through your clothes, keep it low,” instructed a Delta flight attendant as emergency protocols were activated.
Florence Chesson, a flight attendant for JetBlue, reported suffering from traumatic brain damage and lasting nerve issues after inhaling tainted air on a flight to Puerto Rico. She described her disorientation upon landing, noticing other crew members collapsing and becoming ill.
Mentioning her experience, Chae Sung recounted waking up the next day with a burning sensation in her brain and feeling as though she had been exposed to dangerous substances. Her neurologist likened the damage to that of an NFL player suffering from a brain injury after a difficult hit.
Dr. Robert Kanyecki has treated over 100 flight attendants and pilots for brain damage linked to toxic cabin air, describing the effects as a series of “microconcussions.” He noted that these can accumulate and eventually lead to major health concerns.
Dr. Robert Harrison, a medical expert from the University of California, San Francisco, confirmed he has treated many crew members for smoke-related injuries, insisting that these issues are real and not imagined.
A Delta representative defended their safety protocols, stating that they actively monitor and address any smoke-related incidents, which are claimed to be rare. They are also in the process of replacing auxiliary power units in their A320 fleet, with over 80% of the work reported as completed.
Both Airbus and Boeing recognize the potential for oil and hydraulic fluids to leak from engines, releasing toxic compounds into the air supply. Internal emails from Boeing have cautioned about the risks associated with these leaks.
While Boeing insists that cabin air is safe, the FAA describes such contamination events as “rare.” However, data shows a noticeable rise in incidents, with approximately 108 per million passengers affected.
Between 2016 and 2024, JetBlue and Spirit, primarily operating Airbus aircraft, saw a staggering 660% increase in reported smoke events.
In response to airline pressure, Airbus relaxed maintenance guidelines in 2016, allowing jets emitting certain odors to continue operating without immediate checks.
A JetBlue pilot, Andrew Myers, collapsed during maintenance tests after inhaling smoke and later faced a diagnosis of chemical-induced nervous system damage, leading to the loss of his FAA medical license.
Concerns were also raised by Florentina Tudor, a Wizz Air crew member, who reported multiple smoke-related incidents before being suspended. She recounted a colleague’s health crisis being dismissed by the captain as “just pretending.”
In 2017, NTSB Chairman Robert Samwald acknowledged the smoke events but indicated they fell outside the agency’s jurisdiction.
A recent FAA-funded study revealed that chemicals like formaldehyde and tridecane can exceed workplace safety limits when exposed to high engine temperatures.
Harvard aviation quality specialist Joseph Allen criticized the neglect of important safety data in some studies, calling for more attention to cabin air quality.
In an effort to improve the situation, Airbus has proposed a redesign (“Project Fresh”) that could reduce cabin odor events by 85%, although these improvements would only take effect for new aircraft starting in 2026.
