The United States has issued a fresh warning that could severely restrict the international operations of Iranian airlines, escalating Washington’s economic pressure on Tehran and extending sanctions beyond the carriers themselves.
US Treasury Secretary Scott Bessent said Iranian airlines could effectively be shut out of international aviation from Wednesday, September 23, as the administration prepares to target foreign businesses that continue providing essential services to the carriers.
The warning is significant because Iranian airlines operating international routes depend on a wide network of companies and airports outside the country. These include fuel providers, airport operators, ground-handling firms, ticketing companies and financial institutions.
Bessent said foreign businesses that continue supporting sanctioned Iranian airlines could face restrictions on their access to the US dollar financial system. The threat therefore extends the consequences of the sanctions to companies that are not themselves Iranian.
The Treasury secretary’s comments were made during an interview with CNBC on Monday, September 21. He said the United States expects Iranian airlines to be shut down internationally from September 23 and warned that companies facilitating their operations could face serious financial consequences.
The proposed measures represent another step in Washington’s broader campaign to isolate Iran economically.
Airlines already under US sanctions
Iran’s aviation industry has faced American sanctions for years, limiting the country’s ability to purchase aircraft, obtain replacement parts and access some maintenance and aviation technologies.
The pressure intensified earlier this month when the US Treasury announced sanctions against the remaining Iranian airlines that had not previously been designated.
On September 8, the Treasury said it had sanctioned 36 targets connected to Iran’s aviation sector, including all remaining Iranian airlines that had not already been targeted. Washington said the measures were intended to disrupt networks used to support Iran’s aviation industry and restrict access to international financial channels.
The US government has also targeted companies and intermediaries outside Iran that it accuses of assisting sanctioned aviation operations.
Washington’s position is that Iranian aviation networks have been used not only for civilian transportation but also to facilitate activities that the US considers part of Iran’s military and security apparatus.
Iran has long rejected the broader US sanctions regime and has criticised Washington’s efforts to restrict its economy.
What the new threat means
The latest warning could have practical consequences for Iranian carriers even if the airlines continue to possess aircraft capable of flying internationally.
International aviation requires cooperation between airlines and airports. Aircraft need fuel, landing permissions, parking, passenger handling and other services before they can complete international journeys.
Ticket sales and financial transactions are also essential to maintaining international routes.
The US threat is therefore designed to put pressure on the companies providing these services rather than relying solely on sanctions against Iranian airlines.
Bessent warned that foreign service providers could lose access to the US dollar system if they continue assisting Iranian carriers. This could create a difficult choice for companies that conduct business with Iran while also depending heavily on the international financial system.
However, the potential effectiveness of the measures remains uncertain.
Iranian airlines have a relatively limited international footprint compared with the world’s largest carriers. Aviation analyst Saj Ahmad told The National that enforcing the restrictions could prove complicated because multiple companies are involved whenever an aircraft operates at an overseas airport.
He also pointed to countries such as China and Pakistan, which maintain important relationships with Iran, as examples of jurisdictions where enforcement could be more difficult.
China becomes important
Bessent’s announcement came shortly after discussions with Chinese Vice Premier He Lifeng.
China is one of Iran’s major economic partners, making Beijing’s response potentially important to Washington’s sanctions strategy.
According to Bessent, US officials have been discussing sanctions compliance with Chinese financial authorities, including People’s Bank of China Governor Pan Gongsheng.
The US Treasury secretary described the discussions as positive and said Chinese officials had been actively engaged in the sanctions issue.
China’s position could therefore become an important factor in determining how extensively the new restrictions affect Iranian aviation.
Pressure extends beyond aviation
The aviation measures form part of a much wider US campaign against Iran’s access to international finance.
Washington has increasingly relied on secondary sanctions, which can target companies and financial institutions outside the United States for conducting business with sanctioned Iranian entities.
The approach has been used across several sectors, including energy, shipping, technology, gold and digital assets.
The objective is to make it more difficult for Iran to maintain international commercial relationships by increasing the potential cost for companies that continue dealing with Iranian businesses.
For the aviation industry, that pressure could have consequences beyond Iranian carriers. Airports, fuel companies, ground-service providers, travel agencies and other businesses may have to assess whether continuing to serve Iranian airlines exposes them to US financial restrictions.
Potential impact on Iranian travellers
If the measures are widely enforced, Iranian passengers could face fewer options for travelling internationally on Iranian carriers.
The country already has limited access to modern commercial aircraft and aviation technology because of longstanding sanctions. Further restrictions on international services could make Iranian airlines even more dependent on domestic routes and on foreign carriers for international connections.
The National reported that Iran could become increasingly reliant on foreign airlines if its own carriers are unable to maintain overseas operations.
For Iranian passengers living abroad or travelling for business, education and family reasons, disruptions could therefore add another layer of difficulty to international travel.
The consequences will depend heavily on how foreign governments, airports and aviation companies respond to Washington’s warning.
While the United States has announced September 23 as the point at which the new pressure is expected to take effect, the practical reach of the measures will depend on enforcement and the willingness of international service providers to comply.
The latest development nevertheless represents a significant escalation in Washington’s efforts to restrict Iran’s economic links with the rest of the world.
With Iranian airlines already operating under years of sanctions, the threat of losing access to overseas airport services and international financial channels could place additional pressure on an aviation sector that has faced severe restrictions for decades.
