US threatens dollar access over Iranian airline services

The US Treasury said foreign companies serving Iranian airlines risk losing dollar-system access from September 23, widening pressure on aviation links with Iran. Officials said the warning applies to fuel, landing services and ticket-sales support provided to Iranian carriers.

Reaction was not immediately available.

September 23 dollar risk

Treasury Secretary Bessent said the measure marks a new stage in US sanctions enforcement against Iran, according to the government announcement. The stated penalty is aimed at foreign businesses outside Iran that keep Iranian airlines operating through airport services, refueling arrangements or sales channels.

The dollar-system threat matters because many global aviation vendors, banks and payment processors rely on US-linked clearing even when flights do not touch US territory. If counterparties conclude that the cost of servicing Iranian carriers is higher than the revenue, routes, airport access and ticket distribution could narrow for those airlines.

The immediate company-level exposure falls on foreign fuel suppliers, ground-handling providers and ticketing firms that deal with Iranian carriers. Sector exposure runs through aviation services and payments, where compliance teams may need to screen contracts before September 23.

If the warning leads vendors to cut ties, Iran’s aviation network could face tighter access to services while the wider industry absorbs higher compliance costs. If vendors seek licenses or exemptions instead, the macro effect may be more limited, with the main test arriving in the first 24 hours after September 23 enforcement begins.