"The investigations and documents show that technical deficiencies, human error and some of other factors are the main causes underlying air crashes in Iran before and after the Islamic Revolution and traffic control units are not to be blamed in this regard," Naqqash added.
Noting that the traffic control units in Iran control and guide more than 1,000 flights including 400 transit flights on a daily basis, he reiterated that the traffic control and aviation services in Iran are presented according to the world standards.
He pointed to close contact and coordination of Iran's traffic control units in the country's 54 airports with IFATCA, and said, "Iran's traffic control ranks first in the Middle East."
Iran witnessed two air crashes recently. The first incident happened when a Tupolev-154M crashed shortly after take-off from Tehran en route to the Armenian capital of Yerevan on July 15, killing all 168 passengers onboard.
Ten days later, 16 people were killed and 21 others were injured when an Aria Air plane crash-landed in the northeastern city of Mashhad.
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