The European Union was clear on this matter, they want European companies to continue doing business with Iran. Airbus might be publicly stating this but I am sure they are working with Brussels behind closed doors. It's only a matter of time before they find a way around it.
Once other countries start imposing heavy tariffs on US products, the Trump administration will have to reconsider its role as the global economic policeman. It's one thing when your decisions affect your nation but it's a whole different matter when you affect those who have nothing to do with you or with your country. Most European countries have had economic ties with Iran even before the US was born.
um, not really.
Feel free to use modern history to support your desire for non-interference in EU-Iranian ties, but distant history isn't going to support you.
UK, France, Spain may have been in existence in recognizable form at the time of the US birth, but all were absolute monarchies and those "ties" were hardly more than imperialistic silk-road trading; note that all were "Empires" (including the Persian Empire), meaning that wealth and commerce was usually derived from the weak (by force), not the strong. Most European countries didn't even exist in the current state at that point.
While European and Persian culture and settlement may far predate the US, the government, economics, and core foreign policy constructs of the US are far older than that of Europe, and for that matter - most of the world.
Point is, there's no historical underpinning to support the notion that Europe is historically "close" to Iran.
Fast forward to today - the EU wants continued, steady access to Iranian hydrocarbon resources (reduce dependance on Russia) every bit or more as much as they would like independance from US politics.
No country will start a trade war/punitive tariffs against the US over (temporary) lost opportunity in Iran. No one would do it over trade with ANY market - save China (or the EU itself).
A.net needs to take a deep breath; airplane sales is really small potatoes in the world of geo-politics. Someday down the road, Iran will take delivery of their Airbuses, and amazingly probably of some Boeing, too.
As far as what the EU broadly cares about - complete self determination of foreign/economic policy (which is really your point), that's never going to happen until the EU adopts a single voice, single policy, singular will. The EU, for all its wealth and human capital, will always play second, third or fourth fiddle to US, China, Russia in these matters, unless they are willing to fully consummate their union