TEHRAN An F-7 fighter jet was rebuilt in Isfahan's Martyr Babaie Airbase and subsequently joined the active air fleet at the base, announced the public relations office of the airbase on Wednesday. The maintenance crew at the base spent some 5,000 hours to rebuild the fighter jet which had sustained damage during a training exercise, IRNA reported. A ceremony attended by the second-in-command of the army's airforce and the officials of the airbase, featured a 45-minute flight by the rebuilt fighter jet.