In 1948 the USSR blockaded Berlin in an attempt to enforce compliance with their wishes for the city. The Western Allies responded with a successful airlift that ensured the survival of Berlin's population. How many flights were involved?

In 1948 the USSR blockaded Berlin in an attempt to enforce compliance with their wishes for the city. The Western Allies responded with a successful airlift that ensured the survival of Berlin's population. How many flights were involved?
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