Boeing says it is being allowed to sell some spare parts to Iran for a limited period of time so that nation can repair its aging fleet of commercial aircraft.
It is the first time the aerospace giant has done business with Iran since 1979, when Washington imposed sanctions on Iran following the hostage crisis.
The sanctions have since been strengthened to discourage Iran's nuclear program.
But the sanctions were eased recently when Iran agreed to curtail its nuclear activities.
A company spokesman says Boeing can sell parts needed to make Iran's planes safe to fly, but it is not allowed to sell new aircraft at this time.
The U.S. Treasury Department, which enforces international sanctions, had no comment.