New B-21 bomber named 'Raider': U.S. Air Force, in Reuters, 19 settembre 2016. URL consultato il 23 aprile 2017.
«The stealth B-21, the first new U.S. bomber of the 21st century, is part of an effort to replace the Air Force's aging B-52 and B-1 bombers, though it is not slated to be ready for combat use before 2025.»