• US Treasury Secretary Scott Bessent warns Iranian airlines face international shutdown.
• Foreign companies providing services risk secondary sanctions.
• Iranian airlines already face significant restrictions due to prior US sanctions.
• Discussions with China are ongoing regarding compliance with new measures.

This move may indicate a significant escalation of economic pressure on Tehran's aviation sector, which could further restrict Iran's access to international financial and commercial networks. The threat of secondary sanctions suggests that the US may be willing to take a more aggressive stance against foreign companies that continue to support Iranian airlines, which could have broader implications for global trade and diplomacy.