Pacific Southwest Airlines Flight 710
Pacific Southwest Airlines Flight 710 was a Boeing 737-200 flight between the California cities of Sacramento and Burbank, with a stop in San Francisco, that was hijacked by two Bulgarian nationals on July 5, 1972, shortly after take-off from Sacramento Airport. The hijackers demanded $800,000, two parachutes and to be taken to the Soviet Union. The plane landed at the San Francisco Airport, then took off after 20 minutes and spent the next hour circling while the hijackers waited for the airline to accept their demands.
Source: Wikipedia
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