The U.S. Air Force awarded a contract to The Boeing Company to design, modify, test, certify and deliver two presidential, mission-ready aircraft by 2024. This contract sets $3.9 billion as the price for the two completed Air Force One replacement aircraft, saving the taxpayers over $1.4 billion. This contract modification is firm fixed-price and contains over-and-above provisions to address both presidential quality items, or additional test effort induced by the government above the planned program baseline. For more details, see this Military.com article.