Donald Trump threatened on Twitter to cancel a $4 billion Boeing contract. Boeing's stock immediately dropped.

A single tweet from President-elect Donald Trump had immediate real-world implications Tuesday morning, when shortly before the markets opened, Trump criticized Boeing for how expensive its new 747 Air Force One plane is:

He expanded upon that tweet in New York on Tuesday morning, saying "the plane is totally out of control. It's going to be over $4 billion for Air Force One program," he said, per CNBC. "I think it's ridiculous, I think Boeing is doing a little bit of a number. We want Boeing to make a lot of money, but not that much money."

At the mere threat of Trump canceling his order on the latest model of the presidential jet, Boeing's stock plummeted. At Tuesday's opening bell, Boeing stocks were down 0.86 percent and had slid more than 1 percent in early trading. Though that may not sound all that steep, with a market cap at $93 billion, even a 1 percent decline is significant for Boeing.

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Moreover, Politico reported, Trump's tweet seems to have misquoted the actual projected cost of the Boeing 747. Air Force One estimated it would cost $1.65 billion to build two new jets — about $825 million per aircraft.

When asked for comment by The Associated Press, Boeing spokesman Todd Blecher indicated the company still wasn't quite sure how to respond to the president-elect's tweet. "We are going to get back to you after we figure out what's going on," Blecher said.