"Korea’s largest air carrier sent a request to the Transport Ministry on Tuesday to postpone the start of its Iran flights. According to a spokesman for the airline, the major reason for the delay was the difficulty of beginning the service in the face of escalated tension between US and Iran, with Washington tightening sanctions on the Middle Eastern country." (February 2017)
In March 2016, Korean Air announced that it was reinstating direct flights between South Korea and Iran . (Korea Times, “Korean Air to operate direct flights to Iran,” 3/11/2016).