Two air disasters, both of them in California, both of them involving disgruntled passengers, both of them took over the planes by incapacitating the pilots… 2 incidents, 22 years apart. Listen the the stories of doomed Flights 773 and 1771…

http://content.time.com/time/magazine/article/0,9171,145653,00.html

https://aviation-safety.net/database/record.php?id=19640507-0

https://www.cnn.com/2017/08/02/us/us-airline-hijackings-1970s-declassified/index.html