Aseman Airlines is scheduled to start receiving the aircraft in 2022, though the deal is still contingent on approval from the US government. BA also says that it will be seeking approval from the Office of Foreign Assets Control to perform under this transaction. The only thing the US financial sanctions are doing in this case is pushing Iranian airlines to buy from Airbus rather than Boeing.
The memorandum of understanding is the second big agreement Boeing has reached with Iranian airlines since sanctions were eased in January 2016 after an worldwide agreement on the country's nuclear program.
Iranian airlines are ready to buy dozens of Boeing planes - if they can line up financing.
The sides have reached the agreement on Iran's acquiring of the Boeing 737 MAX airplane, IRNA news agency reported. In September, Washington approved the sale of 80 Boeing and 100 Airbus planes to Iran Air.
The Boeing deal got initial approval from the Obama administration after the US and other western nations agreed to drop sanctions on Iran if it reduced its nuclear program.
That deal went into effect in January 2016, and while it appears to retain the confidence of most signatories when it comes to nuclear proliferation, it hasn't stopped Iran from doing things like backing Bashar al-Assad, the Syrian autocrat waging a bloody civil war.
The Boeing deal already has some political opposition in Washington. "The sale of civilian aircraft, and further opportunities for engagement with the Iranian market, is a welcome step in the right direction".
It previously agreed a $16.6bn sale in the Islamic Republic when Barack Obama was in power and after he struck a nurcear deal with Tehran - an agreement which Trump has criticized.
Deliveries of the 30 new airplanes is scheduled to start in 2022.
If Trump decides to nix the deal, it could cost "approximately 18,000 jobs in the United States", according to a Boeing statement that cited US Department of Commerce data.
Boeing's latest announcement puts the Trump administration in the awkward position of choosing between taking a harsher stance against Iran and boosting a major manufacturer, one of the United States' largest exporters.
Similarly, Iranian conservatives have also criticised the purchases, saying new planes will do little to improve Iran's stagnant economy.
The frosty relations between Tehran and Washington further came to the fore recently when Iran imposed sanctions on 15 US firms operating in Iran.