"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," he described.

The new warning and 'promise' was issued after the US earlier this month imposed sanctions on "all remaining Iranian airlines" which had yet to face such penalties - thus Bessent's new declaration is that these entities are about to collapse under the weight of Washington actions, which now is to include secondary targeting.

The Treasury Department has also lately targeted Iranian companies and industries supporting Iran's aviation sector.

Some 27 airlines have already been sanctioned - also most recently the major Mahan Air has faced expanded sanctions (after first being targeted by Washington all the way back in 2011).

The Treasury has famed all of this as part of efforts to deny the Iranian government the ability to move "weapons, personnel, and illicit cargo".

Bessent stated to CNBC that all Iranian airlines will be shut down globally on Sept. 23 - given that any fuel, landing, and ticket providers involved with the companies risk dollar-system exclusion.

Ironically, Iran's President Masoud Pezeshkian and his delegation is expected to fly into New York City just the day prior, on Tuesday - to attend the UN General Assembly. He is set to give a formal address to the UN body on Wednesday.

This will provide rare opportunity for potential White House diplomacy to take place on the sidelines, which could happen as early as Tuesday.

As for the heavily sanctioned aviation industry, in recent years the Islamic Republic has suffered some significant aerial disasters, which included the May 19, 2024 death of President Ebrahim Raisi. His military helicopter went down in a rugged, mountainous area of northwestern Iran.

Some speculate that lack of airline parts and aging aircraft, due to the long-standing US targeting of the industry, has only served to increase the chances of aviation disasters.