US aviation giant Boeing has confirmed a major plane purchase order placed by Iran’s flag-carrier airline Iran Air.

The Chicago-based manufacturer issued in a statement released by The Associated Press said on Tuesday that it had signed deal with Iran Air “under authorizations from the US government following a determination that Iran had met its obligations under the nuclear accord reached last summer.”

“Boeing will continue to follow the lead of the US government with regards to working with Iran’s airlines, and any and all contracts with Iran’s airlines will be contingent upon U.S. government approval,” it said.

Iran Air, the country’s national carrier, said this week it wants to buy new generations of the Boeing 737, as well as the 300ER and 900 version of the Boeing 777, AP reported.

Earlier Tuesday, Iran’s Transportation Minister Abbas Akhoundi said a possible deal between the Islamic Republic and Boeing could be worth as much as $25 billion, on par with the country’s earlier deal with its European rival, Airbus.

“The initial talks were held and I can say Boeing is negotiating with the US officials and possibly the amount of our purchase is equal to Airbus,” Akhoundi has been quoted as saying by AP.

If the deal goes through, he said the first Boeing plane could arrive in Iran in October.

The overall size of the proposed Boeing sale to Iran remains unclear. Ali Abedzadeh, the head of Iran’s Civil Aviation Organization, was quoted Sunday by the state-run IRAN newspaper as saying the sale would involve 100 Boeing aircraft, something the manufacturer has declined to discuss, the report added.

It is likely Boeing may run the sale through an overseas subsidiary and use a currency other than US dollars in order to avoid running afoul of American laws, AP said.