Passengers wait for check-in at a Mahan Air counter at the Mehrabad International Airport in Tehran, Iran, on Dec. 14, 2019. The U.S. Treasury on Wednesday imposed new sanctions on the Iranian airline of Mahan Air and its shipping industry, accusing it of "transporting lethal aid from Iran to Yemen." Iran's Civil Aviation Organization (CAO) dismissed any negative impact of recent U.S. sanctions on the Islamic Republic's airlines, Tehran Times daily reported on Friday. (Photos: Xinhua)

Passengers wait for check-in at a Mahan Air counter at the Mehrabad International Airport in Tehran, Iran, on Dec. 14, 2019.

A man leaves a Mahan Air counter after check-in at the Mehrabad International Airport in Tehran, Iran, on Dec. 14, 2019.

Photo taken on Dec. 14, 2019 shows an Airbus A340 of Mahan Air approaching the Mehrabad International Airport in Tehran, Iran, on Dec. 14, 2019.