Reassessment regarding the Iran policy by Trump administration is going to have effect on the trading of aircrafts by the aerospace giants Boeing and Airbus. For the both companies were competing with each other to win orders and both have succeeded in getting orders from Iranian airlines.
Airbus has delivered only handful of planes to Iranian companies. The join decision by Congress and European partners would definitely detrimental to Airbus.
Under the 2015 nuclear deal, Iran agreed to curb its nuclear program in exchange for significant sanctions relief. Now the supporters of the accord have a fear of the consequences of the breach.