It was the latest example of Trump using his podium, often via Twitter messages, to rattle companies and foreign countries as he seeks to shake up business as usual in Washington. Trump, who takes office on Jan. 20, took aim at what he called cost overruns even though the plane is only in development stages.

Here’s what Trump tweeted:

It was not immediately clear what prompted the timing of his complaint.

Trump, who has vowed to use his skills as a businessman to make good deals that benefit American taxpayers, then made a surprise appearance in the lobby of Trump Tower in New York, where he amplified his comments.

“The plane is totally out of control. 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,” he told reporters.

Boeing, which has built planes for U.S. presidents since 1943, has not yet begun building the two replacements for the current Air Force One planes, which are scheduled to be in service by 2024.

Boeing has not yet been awarded the money to build the proposed replacements.

“We are currently under contract for $170 million to help determine the capabilities of these complex military aircraft that serve the unique requirements of the President of the United States,” the company said in a statement.

Boeing Chief Executive Dennis Muilenburg called Trump after his remarks and they had a constructive dialogue, sources familiar with the conversation told Reuters. Muilenburg told Trump the cost of the airplane could be lowered if the U.S. Air Force changed its requirements and the issue would likely be resolved without a major dispute, the sources said.