original_query: What was the purpose of the Tu-114 aircraft's first trip to the United States in September 1959?
query: What was the purpose of Nikita Khrushchev's first trip to the United States in September 1959, which he took aboard the Tu-114?
answer: Nikita Khrushchev's first trip to the United States aboard the Tu-114 in September 1959 was the first such visit by any Soviet leader.