I have worked in both the USA and Iran and like the people of both countries and the politicians of neither. I found Iranians polite, hospitable, worldly wise and pragmatic. And they don't believe propaganda, from either their own leaders or from outsiders.
If Norwegian keep this low key, any problems getting their plane fixed are unlikely to originate in Teheran.
When the US invaded Iraq a friend described it to me as the high noon of American power and influence. I think he was right. The US is increasingly unloved and hard to deal with, but its current behaviours will hasten its decline.