Boeing was supposed to deliver a replacement for Air Force One last year, but significant delays have cost the plane maker billions on the project. They have also drawn ire from the president, who told reporters aboard Air Force One in February that he was “not happy with Boeing” and might purchase a plane elsewhere.

The two 747-200s that serve as the American president’s command center in the sky are more than 30 years old and were meant to be phased out of service years ago.