A Karun Airlines Fokker 100, registration EP-AWZ performing flight NV-2633 from Ahwaz to Rasht (Iran), was climbing out of Ahwaz's runway 12 when the crew stopped the climb at FL180 reporting smoke in the cabin. The aircraft returned to Ahwaz for a safe landing on runway 30 about 30 minutes after departure.
Passengers reported the cabin filled with thick smoke that began to emerge from the back of the cabin.
The airline reported a technical defect in an aircraft system prompted the return to Ahwaz. All passengers are in "perfect health". An alternative transportation to Rasht is being organized.