Source: Simon Hradecky | www.avherald.com

A Spirit Airlines Airbus A321-200, registration N660NK performing flight NK-630 from Los Angeles,CA to Denver,CO (USA), was climbing out of Los Angeles when the crew stopped the climb at FL260 due to an unknown odour in cockpit and cabin. The aircraft returned to Los Angeles for a safe landing on runway 25L about 40 minutes after departure. One person was taken to a hospital.

The FAA reported the aircraft returned to Los Angeles due to fumes in cockpit and cabin.

Los Angeles Fire Department reported the passenger oxygen masks were released.

The airline reported the oxygen masks were not deployed, one person was taken to a hospital.