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From airplanes to oilfields, billions of dollars are on the line for international corporations as President Donald Trump weighs whether to pull America out of Iran's nuclear deal with world powers.

Regardless of where they are headquartered, virtually all multinational corporations do business or banking in the U.S., meaning any return to pre-deal sanctions could torpedo deals made after the 2015 agreement came into force.

That threat alone has been enough to scare risk-averse firms, like Boeing Co., into slow-walking deals agreed to months ago. A complete pullout by the U.S. would wreak further havoc and likely frighten off those considering taking the plunge.