Passage: Pan Am was replaced when BOAC acquired 49% of MEA's shares in 1955.  A Vickers Viscount was introduced in October 1955 while an Avro York cargo aircraft was leased in June 1957. On 15 December 1960 the first of four de Havilland Comet 4Cs arrived.  After the association with BOAC ended on 16 August 1961, MEA was merged with Air Liban on 7 June 1963, which gave Air France a 30% holding, since relinquished.  The full title was then Middle East Airlines – Air Liban.

Question: What year did the first of four Havilland Comet 4C's arrive?
1960