"Boeing is building a brand new 747 Air Force One for future presidents, but costs are out of control, more than $4 billion. Cancel order!," he tweeted.
The US government had selected Boeing as the manufacturer in January 2015. It is to be noted that Boeing's 747-8 was the only plane which is capable of meeting the requirements for the presidential aircraft while also being "consistent with the national public interest," Air Force Secretary Deborah Lee James said in a statement at the time.
She insisted that the Pentagon "will insist upon program affordability through cost-conscious procurement practices."
Addressing reporters at Trump Tower in Manhattan, Trump explained his tweet: "The plane is totally out of control. It's going to be over $4 billion for Air Force One program, and 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."
Trump spokesman Jason Miller told reporters that the president-elect is willing to closely examine the budget of Pentagon and look for areas where he can find savings.
"I think this really speaks to the president-elect's focus on keeping costs down across the board with regard to government spending," he said. "I think people are really frustrated with some of the big price tags that are coming out for programs, even in addition to this one. So we're going to look for areas where we can keep costs down and look for ways where we can save money."