If you get stopped at security and are told to check your poles, you face a major problem if you use standard telescoping poles. Most telescoping poles collapse down to about 25 inches (63cm)—which is simply too long to fit inside a standard 22-inch carry-on suitcase. You'll be forced to awkwardly strap them to the outside of your bag, risking damage.
This is exactly why flying with Z-fold trekking poles is an absolute game-changer.