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 may purchase a plane elsewhere.

Boeing has not officially confirmed any changes to the $3.9 billion fixed-price contract it signed during Trump’s first term. It has absorbed more than $2.5 billion in losses on the project.

The Trump administration plans to accept a luxury Boeing 747-8 plane as a donation from the Qatari royal family that will be upgraded to serve as Air Force One, which would make it one of the biggest foreign gifts ever received by the U.S. government, several American officials with knowledge of the matter said.