Two Iranian passenger planes made emergency landing in Istanbul due to engine problems on Thursday landing at Istanbul's International Ataturk Airport due to an engine trouble. The Airbus A300 plane was carrying 236 passengers and cabin crew. Airport authorities said the engine of the plane is now under examination at the airport. According to semi-official Anatolia news agency, another Iranian passenger plane of Iran's private air carrier Mahan Air, another A300, made an emergency landing at Ataturk Airport.