A Spirit Airlines Airbus A319-100, registration N512NK performing flight NK-902 from Dallas Ft. Worth,TX to Orlando,FL (USA), was descending towards Orlando when an odor of musty dirty feet began to develop in the aft cabin, a number of passengers began to complain about the odor, 3 cabin crew began to feel unwell, light headed with nausea, headache and stomach cramps.
The captain instructed the cabin crew to use their oxygen bottles and performed a rapid descent to 10,000 feet and continued to Orlando for a landing without further incident. The three affected cabin crew went to the emergency room.