At the end of the Obama administration significant sanctions on Iran were lifted. We started to see a flurry of economic activity including a deal to buy 80 Boeing aircraft. There was even talk of Iran Air breathing life into the Airbus A380 program. Those hopes were dashed with the re-introduction of sanctions by the current administration.
Yet Iran commercial aviation managed to keep to the skies, in part because of ‘smuggling’ of aircraft parts into the country.