Iran airlines face global shutdown threat by Sept 23: What to know

The US Treasury Secretary has issued a stern warning that Iranian airlines could be completely shut down globally starting September 23. This comes as Washington escalates economic pressure on Tehran through sanctions targeting the country's aviation sector. US officials warn that foreign airports, airlines and companies that continue to serve Iranian carriers could face consequences under the US sanctions regime.

Consequences of US sanctions include difficulties in procuring essential services such as aircraft refueling, landing assistance, ticket sales and financial services, which could effectively cut Iranian airlines off from the global financial system. Iraq appears to be considering a ban on Iranian airlines, and other airlines have already begun suspending flights to and from Iran.

The ultimate impact on international flights remains to be seen, but the threat of secondary sanctions is expected to make it increasingly difficult for Iranian airlines to maintain their operations globally.