It is hard to answer this objectively. I think this makes sense because most of economical sanctions were coming from USA and EU. What Iran is getting after lifting the sanctions is briefly mentioned here:
The EU will end its embargo of Iranian oil, which should pump more
money into the Iranian economy. An increased supply of oil globally,
perhaps an increase of a million barrels a day or even more, could
well push the price down.
And the EU will, as well, end its banking sanctions, meaning that Iran
will again be able to participate in the Swift system of electronic
banking -- something that is essential to participation in the global
It is clearly arguable, but a correlation between a favorable political decision and a major business deal is highly probable.
Also, I think jets quality might play a role here. I know nothing about commercial jets assessment, but a quick search returns this small qualitative top, which clearly shows domination of Airbus and Boeing dominance.