Alaska Air flight 892 heading to San Diego had to return to the Honolulu International Airport Wednesday evening after several flight attendants got sick from a mysterious odor on the plane.
An Alaska Airlines spokeswoman said the flight departed Honolulu at 4:10 p.m. About an hour into the flight, flight attendants reported smelling an unusual odor in the back of the cabin. That's when pilots decided to turn around, declared an emergency to get priority landing and landed without incident in Honolulu at 6:39 p.m.
State Department of Transportation officials say the four crew members requested to be transported to the hospital for evaluation.
Emergency Medical Services said the patients experienced "nausea, headache type systems possibly from fumes."
One passenger told Hawaii News Now other passengers appeared to show signs of being sickened. However, Alaska Airlines said none of the passengers reported feeling ill.
Airport rescue firefighters were waiting for the plane when the flight landed back on Oahu.
Alaska Airlines said all 76 passengers and six crew members were put up in hotels and will be re-booked on Thursday.
The plane was taken into maintenance.
The cause of the odor is unclear at this time.
DOT officials said no airport operations were impacted.