Why is the ninth month called September?
"to hijack an airplane," 1961, apparently coined in New York "Mirror" headlines, from sky (n.) + second element of hijack (q.v.).
: the week's third skyjack to Cuba (1968+)
To take control of an aircraft illegally, usually by claiming to have a weapon or a bomb; commit air piracy (1961+)
[modeled on hijack]