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?

History Trivia: 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?