My experience over 12 trips between the US and Europe has been the same. Carbon Z-poles for me and Pacer Poles for my wife. Never a question including Madrid, Frankfurt, and Lisbon. My Pack has been inspected and looked into several times for other objects that need to be looked at. The poles have been removed by agents while checking the pack and never questioned...just put back in.
If there is a problem...it will be in Europe not the TSA in the USA.
I am always prepared to check them (not the pack) just in case but for the past 9 years or so...no problems.
Many of the negative posts concerning carrying them on from the US are from folks who are simply reading the "rules" or calling an operator at the TSA and asking. The easy answer by a telephone agent is "no"
The facts on the ground by the working TSA agents point to the fact that they are allowed.
Few, if any, first person reports of being denied with poles with rubber tips inside packs in the US.
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@peregrina2000 I conltinue to carry mine on.
ADDED: However....poles are
not allowed on the return flights out of Santiago. I always check everything except valuables on the way home as it really doesn't matter if it arrives with me or not.