Evening in Byzantium (1978)

While the prestigious Cannes Film Festival goes on around him, American movie producer Jesse Craig struggles to develop a pitch-worthy thriller about a terrorist plot. Before long, Craig becomes concerned that a shocking act of real-life terrorism already may be underway. Meanwhile, radical actor Bret Easton works in cahoots with a group of extremists to coordinate the hijacking of a trio of passenger planes in a devastating, multi-city nuclear attack.