The Pentagon has confirmed that Boeing is to receive $3.9 billion to build two new aircraft for use as Air Force One planes to serve the U.S. president.

The decision was revealed on the Department of Defense website Tuesday, stating the contract will include “detailed design, modification, testing, certification, and fielding of two presidential, mission-ready 747-8 aircraft.”

The work is to be carried out in San Antonio and Pentagon officials expect the new planes to be ready by the end of 2024.

The current planes are almost 30 years old and are due for replacement. But in December 2016, then-President-elect Donald Trump tweeted his opposition to the contract due to its cost of "more than $4 billion."

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Air Force One has always consisted of two planes and the first official presidential jet, a Boeing 707/VC-137, flew in 1959 with President Dwight D. Eisenhower on board.