If you refer to the sanction that denies the sell of spare parts for US made civilian aircraft, it was taken unilaterally by the US. I don't really remember when this sanction started and for what reason.
(I may be wrong, but I think this sanction was imposed following the MIA bombing in Buenos Aires by Al-Quds and Hezbollah terrorists.)
I know this sanction is problematic for Iran's aviation. Iran negotiators should discuss with the US to get it lifted.




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