Honduran Air Force
On 17 March 1980, the first examples were introduced to operational service with the Spanish Air Force, which would be the principal customer for the C-101. The initial model possessed only a limited weapons capability, this attack capability was expanded upon later-built aircraft. Several models were exported to overseas operators; the C-101 has been adopted by the Chilean Air Force, Honduran Air Force and the Royal Jordanian Air Force. A final improved model, designated "C-101DD", was demonstrated but did not find customers and thus it did not enter serial production. In addition to its use as a trainer aircraft, it has been used to perform aerobatics; in the latter context, it has been flown by the "Patrulla Aguila" aerobatics team. As of 2019, the C-101 remains in service in the Spanish Air Force and several other countries.