According to Iranian Student News Agency (ISNA), this type of flights are flights by foreign airlines through the airspace of a country en route to their destinations. Airlines are required to receive necessary permission and authorization from the countries whose airspace they pass through during their flight, and have to pay a certain amount as a fee.
Since Iran is located in both the East-West and North-South air corridors, it plays an important role in providing the best possible secure routes for flights between the Persian Gulf states to Northern European and North Atlantic countries.
Before June 2015, each day 450 flights on average were registered as passing through Iranian airspace. However, following instability in Ukraine and Iraq, that number has increased by 100 percent, and currently more than 900 international flights pass through Iranian airspace daily.
