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April 17th
According to Wikipedia and other sources, on April 17th:
1897 – The Aurora, Texas UFO incident
1907 – The Ellis Island immigration center processes 11,747 people, more than on any other day.
1961 – Bay of Pigs Invasion: A group of CIA financed and trained Cuban exiles lands at the Bay of Pigs in Cuba with the aim of ousting Fidel Castro.
1964 – Jerrie Mock becomes the first woman to circumnavigate the world by air.
1964 – Ford Mustang is introduced to the North American market.
1970 – Apollo program: The ill-fated Apollo 13 spacecraft returns to Earth safely.