"Instead of fighting with one of our closest allies, we are finally coming together against a common threat," U.S. trade representative Katherine Tai said.
CEO Dave Calhoun predicted it will likely take several more years after 2021-2022 before long-term growth trends recover to 2019 rates.
President Donald Trump said Friday that the U.S. "can't let anything happen to Boeing."
Boeing's European rival, Airbus, also stands to lose deals if the U.S. imposes sanctions against Iran.
The firm has released plans for sleeping and recreation modules which could sit in aircraft cargo holds by 2020.
The pilots of at least three separate aircraft encountered an unidentified flying object above southern Arizona and New Mexico last month.
Airbus' modular plane concept uses swappable plane interiors to offer amenities like gyms and spas.
Aviation experts tell Newsweek about the impeccable safety record of the Airbus A320.
While in Paris, he will sign a contract to purchase 114 Airbus planes to add to Iran Air's fleet.
The airline's maintenance system was "not optimal", investigators said.
The plane was on a test flight; accident is first involving Europe's newest troop and heavy cargo carrier.