It was preceded in 1959 by another equally senseless and irresponsible practice: the hijacking and diversion of aircraft in mid-flight, a phenomenon which was practically unknown in the world at that time.
在这以前，从1959年起，就采取了一种同样荒唐而不负责任的做法：劫持飞机使其在中途转向，这一现象当时在世界上几乎还是鲜为人知的。