Since 2000, both narrow-body and wide-body trijet production has ceased for almost all commercial aircraft, being replaced by twinjets. As of 2016, the Falcon 7X, 8X, and 900 business jets, all of which use S-ducts, are the only trijets in production. Some old models, such as the 727, Tu-154, DC-10, and MD-11, have found second careers as cargo aircraft, as well as limited charter, governmental, and military service. The most widely used trijets are the DC-10 and the MD-11, mostly operated by UPS Airlines and FedEx Express in cargo service.