Hi JF, you might like to check out this
https://www.caminodesantiago.me/community/threads/flying-with-trekking-poles.4636/ or any of the many other threads on this issue. It has been discussed frequently. Consensus has been check your poles unless you are content to risk having them confiscated at the gate. An occurrence almost guaranteed at Santiago airport; though arguably it doesn't matter by then. Yes, there are frequent tales of successful carry-ons but there are many more of loss or last minute check-ins. It doesn't seem to matter what the
rules are, see link, as the decision is made by the individual staffing the gate. Maybe, if the TSA will provide you with a clear written statement that you are permitted to take a "
penetrating object' into a flight cabin because its ok its only trekking poles you might be ok. But the gate staff just might decide they don't care what the TSA thinks because the safety of the flight is their responsibility at the moment they make their decision.