It is the Czechoslovakians first locally designed and constructed jet aircraft, as well as likely being the biggest aircraft industrial program to take place in any of the Council for Mutual Economic Assistance countries except the Soviet Union.
The Delfin served in basic, intermediate and weapons training roles.
For the latter mission, they were equipped with hardpoints to carry gun pods, bombs or rockets, the L-29 functioned as a relatively good ground-attack aircraft when deployed as such.