Skyjacked

Skyjacked movie poster.

Movie (1972)
French title: Alerte à la bombe

Starring:
Charlton Heston (Captain Henry O'Hara)
Yvette Mimieux (Angela Thatcher)
James Brolin (Jerome Weber)
Walter Pidgeon (Senator Lindner)

A passenger aboard Global Airways Flight 502, discovers a bomb threat written on the mirror of one of the first-class bathrooms. The captain then changes course for Alaska but eventually need to land in Soviet Union.

Boeing 707-373C

Fictional "Global Airways", this airplane is provided by World Airways.
Reg. N374WA c/n 18583. Later registered as HZ-ACF.
Same aircraft as "Sovereign Airways" in other movies at IMPDb: Frequently Seen Aircraft.