The Eurofighter jet was flying over the sea before Terracina, a town lying some 110 km south of the Italian capital, when it suddenly plunged into the sea, Xinhua reported.
A search and rescue mission was launched immediately after the incident, and the body of the pilot was recovered, the Air Force said in a statement.
Thousands of people had gathered in the afternoon to watch the air show, which should have also involved the "Frecce Tricolore" -- a famous aerobatic demonstration team of the Air Force.
Several amateur videos were shot by spectators, and spread on social media, showing the plane performing a dive in the air before collapsing into the waters.
The Air Force stated the jet belonged to the its Test Flight Department, and crashed after entering the final phase of the flight schedule.
The causes of the incident were still unclear, and an investigation was launched into it.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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