In 2000, China United Airlines spent US$120 million to buy a Boeing 767-300ER, which was previously ordered by Delta, as Jiang Zemin's private jet. Several days before its first flight, covert listening devices were found installed in toilet, corridor, and even in Jiang's headboard. Listening device were believed to be controlled and monitored by satellite. CIA, U.S embassy in China, and China United Airlines refuse to comment on this incident. The specific aircraft was sold to Air China and later to Sunday Airlines of Kazakhstan.