Washington Has Started Sanctioning the Companies That Service Iran's Aircraft, Wherever They Are

The US Treasury issued sweeping new sanctions against Iran on Tuesday, aimed at the country's airlines and, more consequentially, at the international companies that service them.

The measures form part of what the administration calls Operation Economic Outcast, described by the White House as an unprecedented campaign to sever every remaining economic lifeline sustaining the Islamic Republic of Iran. With negotiations stalled and the two countries in active hostilities again, the economic pressure is meant to force Tehran towards a settlement.

The airlines, and one airline in particular

The Treasury's Office of Foreign Assets Control designated 27 Iranian airlines, saying they have long supported the Iranian regime's destabilising activities.

The weight of the action falls on Mahan Air. The carrier was first sanctioned by the United States in 2011 and is also under European Union sanctions, and has been accused for years of moving personnel, equipment and funds for the Islamic Revolutionary Guard Corps. Tuesday's measures are aimed squarely at grounding it.

They build on earlier rounds. Treasury Secretary Scott Bessent said the action extends work taken in April and July targeting persons servicing Mahan Air's domestic and international flights.

OFAC also suspended three Iran-related aviation authorisations. Those had permitted overflights, and allowed non-US airlines to fly aircraft of American origin or under American control into Iran.

Let this be a warning to anyone doing business with Iran's remaining airlines

The nine companies that are not in Iran

The significant part of this package sits outside Iranian jurisdiction entirely.

The Treasury says Iran routes its aviation needs through front companies and pass-through entities in third countries to disguise the link back to Tehran, and it has designated nine internationally based entities accused of assisting. The stated target is covert front companies, foreign intermediaries and deceptive transshipment routes used to obtain aircraft and sensitive technology of American origin.

The geography is the message. Two commercial entities and one individual in the United Arab Emirates. One firm in Turkey and one in the United Kingdom. Then four cargo providers and general sales agents accused of servicing Mahan Air and coordinating shipments on its behalf, two of them in Turkey, one in Kazakhstan and one in Malaysia.

Bessent left no ambiguity about the intended audience. Let this be a warning to anyone doing business with Iran's remaining airlines, all of which were sanctioned, he said. You are at risk of being cut off from the global financial system.

Why servicing matters more than ownership

Iran's commercial fleet is old, and it has been kept airworthy through exactly the kind of foreign intermediaries now being named.

Sanam Vakil, director of the Middle East and North Africa programme at Chatham House, says the measures will exacerbate the difficulties Iran already faces in maintaining its aircraft. Because the fleet depends on outside entities for upkeep, going after companies beyond Iran's borders is likely to do real damage. It restricts Iran's ability to rely on regional hubs, she says, and may push international carriers to reduce or suspend Iranian services further.

Her assessment of where that leads is blunt. If that happens, she says, this becomes a blockade of Iran's aviation infrastructure, which is quite serious.

Jack Roush, a doctoral candidate affiliated with the Iranian History Initiative at the London School of Economics, describes the objective in similar terms: to intensify Iran's economic isolation, degrade its military capability further, and push it towards a concession or settlement that favours the United States.

The mechanism, and its limits

Sanctioning an Iranian airline is largely symbolic on its own, because a designated Iranian carrier was never going to access American financial markets. Sanctioning a cargo agent in Kuala Lumpur or a services firm in Dubai is a different instrument. It presents every company in the chain with a choice between Iranian business and the dollar system, and the arithmetic there is not close.

The limitation is the same one every secondary sanctions regime runs into. Intermediaries are cheap to replace. A designated firm in Turkey can be wound up and reconstituted under a new name, and enforcement then has to find it again.

What the Treasury is betting on is deterrence at scale rather than the removal of these nine specific companies. The warning is aimed at the hundreds of service providers who have not yet been named and now have to price the risk of being next.