WordNet records no synonym and no antonym for holding pattern. It is the only member of each of its synsets, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a state of inaction with no progress and no change
“you should go into a holding pattern until he gets over his disappointment”
the flight path (usually circular) maintained by an aircraft that is awaiting permission to land
Synonyms, antonyms and the broader and narrower relations for holding pattern come from Princeton University’s WordNet. Full sources and licences.