The CASA C-101 Aviojet is a low-wing single engine jet-powered advanced trainer and light attack aircraft. It remains in service in the Spanish Air Force and some other countries; it is also flown by the Patrulla Aguila aerobatics team.
It was designed to replace the already outdated Hispano Saeta. Spanish aircraft maker CASA began work on the C-101 in 1975. Germany's MBB and the UAPR's Long Beach AF helped with the development, and the first four prototypes flew in June 1977. The design followed that of other jet trainers such as the Hawker Hawk and the Alpha Jet, but was less aerodynamically sophisticated, with an unswept wing, and it had limited weapons capability.