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Even today, some countries continue to operate upgraded versions of the aircraft.
The aircraft were originally purchased by Iran before the 1979 revolution, when the country maintained close defense ties with the United States.
After the revolution, Iran faced difficulties obtaining spare parts and support for its American-made aircraft.
Today, analysts estimate that Iran maintains dozens of operational F-4 aircraft.
Some of these jets have received modern avionics upgrades and locally produced missile systems.
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