In the HBO made-for-tv movie "By Dawn's Early Light", the commander of the navy (codename "Harpoon") explains to the US President that USAF nuclear bombers are at their positive check points and await further orders. Asked about why those bombers weren't yet sent for a nuclear strike against Soviet Union, Harpoon responds that it's meant to give a moment of pause and make both sides reconsider their actions.
Does it have any basis in real-life procedures, or was it made up for the movie? For such a procedure to work, it would have to be reflected in analogous Soviet procedure, too.