US Treasury Secretary Scott Bessent warned that Iranian airlines could effectively be shut out of international travel from Wednesday. In remarks on Monday, Bessent said, "On September 23, all the Iranian airlines will be shut down around the world." The warning is aimed not only at the airlines but also at the airports, fuel suppliers, ticketing companies and other businesses they rely on to operate abroad. Bessent said, "If they land, you cannot provide them with fuel, you cannot provide them with landing services, you cannot sell them tickets, or you will be knocked out of the dollar system." The threat marks the latest step in US President Donald Trump administration's escalating economic campaign against Tehran.