In 1992, Diamond Aircraft introduced the DA20-A1 Katana in Canada and started a very successful line of two-seat airplanes. Since 1998 the DA20-C1 Eclipse has been at the top of this line with the Teledyne Continental IO-240-B3B engine, which develops 125 HP. Over 200 units have been delivered and found enthusiastic friends all over the world.

Distribution of the Diamond DA20-C1 to Embry-Riddle Aeronautical University began in November 2002. With 35 aircraft of the DA20-C1 type the US Airforce Academy, Embry Riddle will train 500 Air Force cadets annually at the academy in Colorado Springs, Colorado.

Another variant of the DA20-C1, the DA20-C1 Evolution, is a model with easy-to-operate equipment. Being ideal for basic flight training, it is widely used by reputable flight schools.