US Sanctions Threaten Thai Support for Iranian Airlines
Starting September 23, 2026, foreign businesses aiding Iranian airlines risk being cut off from the global dollar-based financial system. The US Treasury Department’s latest warning targets any entity — from airports to fuel suppliers — that continues providing services to Iran’s commercial aviation sector, including Mahan Air, which operates flights between Tehran and Thai cities.
Any service provider connected to Iranian carriers risks losing access to US dollar transactions, a move that could cripple international operations for Thai companies reliant on global banking networks. The sanctions specifically target essential aviation services: aircraft refuelling, ground handling, ticket sales, and reservation systems.
Mahan Air’s Thai Routes at Risk
Mahan Air (W5) currently flies weekly between Imam Khomeini International Airport (IKA) in Tehran and two Thai hubs: Suvarnabhumi (BKK) and Phuket (HKT). Airports of Thailand continues to list the airline as an active operator at both locations. While the airline has maintained service for years, its operations now depend entirely on Thai-based support services.
These include fuel suppliers, ground handling firms, and ticket agents — all of which could be forced to sever ties due to the US threat. The Treasury has not named specific Thai companies in this round, but past actions show enforcement is not hypothetical.
My Aviation Company Limited, a Bangkok-based general sales agent for Mahan Air, was sanctioned by the US in 2018 for booking and cargo services. A second Thai firm, Asian Aviation Logistics, was similarly targeted in 2014 for ground-handling duties. These precedents demonstrate that US authorities have already acted against Thai intermediaries.
Thailand’s Financial Reality: No Law, But No Choice
Thailand has no domestic law requiring compliance with US sanctions. Neither the Civil Aviation Authority of Thailand nor Airports of Thailand has issued an official statement regarding Mahan Air since the latest warning.
Yet the economic pressure is overwhelming. Losing access to US dollar clearing systems would disrupt nearly every major Thai financial institution. Banks like Bangkok Bank and Kasikornbank rely on correspondent accounts in US financial networks to process international payments. Even indirect exposure through a single transaction with a sanctioned entity could trigger automatic filters in global banking systems.
The Anti-Money Laundering Office (AMLO) does not enforce US sanctions, but it automatically flags transactions involving entities on US-designated lists. Any financial link to Mahan Air — whether through fuel payments, ticket sales, or ground fees — could trigger internal audits, fund freezes, or voluntary reporting to US authorities to mitigate risk.
Regional Pattern: Silence as Compliance
ICAO, the UN’s civil aviation body, opposes unilateral sanctions that disrupt international air connectivity. But it has no power to enforce its guidelines. Regional neighbors — Malaysia, Indonesia, the Philippines — have not publicly challenged the latest US move.
Historical patterns show businesses in Southeast Asia typically comply quietly to avoid financial isolation. Firms in these countries have routinely withdrawn services from sanctioned entities — not because of legal obligation, but because the cost of non-compliance is too high.
What Happens Next?
Mahan Air has not announced plans to cancel its Thai routes. Passengers with tickets should monitor official airline channels. Thai airports may remain silent unless forced by regulatory action.
The deeper impact is structural: Thailand’s role as a regional aviation hub now carries an unspoken exclusion policy. Businesses that once saw Mahan Air as a niche route now weigh profit against existential risk. The cost of compliance is minimal. The cost of defiance — severed from the global financial system — could be irreversible.
