Notably the S-Class introduced the first airbag supplemental restraint systems, seatbelt pretensioners, and electronic stability control. The latest generation, the W221 S-Class, premiered in 2007 as an all-new design. As in previous iterations, the latest S-Class is sold in standard and long wheelbase versions and offers V6, V8, V12, and diesel powertrains. The W221 is the second consecutive generation of the S-Class to be solely produced in a sedan body style; past two-door coupe models of the S-Class became known as the CL-Class in 1998. Since 2003, the traditionally rear-wheel drive S-Class also offers 4Matic all-wheel drive in some markets. In the U.S., base prices for the W221 S-Class range from $87,475 for the S550, $144,975 for the S600, $127,775 for the S63 AMG and $194,775 for the S65 AMG. The name "S-Class" derives from the German word "Sonderklasse" of which "S-Class" is an abbreviation. Sonderklasse means "special class," and in automotive terms thus refers to "a specially outfitted car." Although used colloquially for decades, the "S-Class" designation was first officially applied in 1973 with the debut of the W116 model line.