Two Planes, Six Days, One Airport, the Same Strange Smell

Honolulu’s Daniel K. Inouye International Airport dealt with two unrelated cabin fume incidents inside six days this month. The first came on September 19, when Delta flight 394 left Kahului on Maui for Seattle with 189 passengers, two pilots and four flight attendants aboard. Shortly after departure the crew detected fumes in the cabin and diverted to Honolulu. Emergency medical crews met the Airbus A321neo on arrival; three women aged 42, 27 and 31 were taken to hospital in stable condition and a fourth person was treated at the airport.

The second came on the night of September 24 into September 25, on an Alaska Airlines flight from Los Angeles to Honolulu operated by Hawaiian Airlines. Seven Hawaiian flight attendants reported nausea and headaches from an unidentified odour in the cabin. The aircraft landed normally and paramedics assessed the crew outside Terminal 1; all seven declined transport to hospital. Hawaiian said no guests were affected. The two events involved different airlines, different aircraft types and different routes, and there is no suggestion of a common cause.

Fume events are a long-running and unresolved argument in commercial aviation. On most airliners cabin air is bled from the engine compressors, which creates a path for oil or hydraulic fluid vapour to enter the cabin if a seal degrades. Symptoms — headache, nausea, dizziness, a smell variously described as dirty socks or wet dog — are consistent enough that crews are trained to recognise them, but the incidents are hard to reproduce on the ground and the long-term health question remains genuinely contested among researchers, regulators and unions.

What makes the Honolulu pair worth noting is not a shared fault but a shared consequence. Both aircraft were operating long overwater sectors where the nearest suitable diversion airport can be hours away, which is precisely why crews act early rather than pressing on. In the Delta case, ground staff also observed fuel discharging from the aircraft after it reached the gate, giving maintenance a second problem to examine. Neither airline has published findings. Flight attendant unions have spent years pressing US regulators for mandatory reporting and air-quality sensors on new aircraft.

Sources: Hawaii News Now, Honolulu Star-Advertiser