The Boeing 747-8 being offered to Donald Trump by Qatar once served the Qatari royal family and has been sitting unsold for years.

The jet, a lavishly configured version of Boeing’s largest passenger aircraft, has been lingering without a buyer since being put up for sale in 2020, according to aircraft listings and aviation analysts.

John Goglia, a former member of the National Transportation Safety Board, told Forbes that giving the 747-8 to the U.S. would allow the Qataris to avoid maintenance costs that were only getting higher—with the 747 fleet shrinking worldwide and fewer mechanics available who know how to work on them.