Tehran skyline on Saturday
Turkey has been paying for Iranian natural gas with an increase in gold exports of 11,000% in 2012.
The Airbus A-300, owned by a Turkish private company, landed at Atatürk Airport for refuelling and personnel reshuffle on 1 January. It reportedly flew from an African country, possibly Ghana, with a listed destination of Dubai.
The plane is currently locked, with its front door and cargo gate sealed and a special security team on guard. Anatolia said the plane will depart after the necessary documents are presented.