The incident happened soon after the plane, which had 185 passengers onboard, took off from Muscat airport.
The four passengers were treated by the airport doctor and declared fit to travel. Few other passengers who had experienced discomfort and ear pain soon became alright after the aircraft landed back and they were inside the terminal building, the statement said.
The flight 'IX - 350' had 185 passengers, including 3 infants. It was a Boeing 737-8 aircraft.