On 21 February 1970 , the group used its first barometric triggers to detonate two in-flight airliners nearly simultaneously . A Swissair flight to Tel Aviv that fell in Aargau Canton , killing 41 , and an Austrian Airlines flight from Frankfurt to Tel Aviv , which actually failed to destroy the aircraft , which made an emergency landing . The PFLP-GC was also responsible for the Avivim school bus massacre in 1970 and the Kiryat Shmona massacre in 1974
Kiryat Shmona massacre
Kiryat Shmona massacre
Popular Front for the Liberation of Palestine – General Command