I've flown several times with my collapsable METAL poles.
FIRST – I put the rubber caps on securely over the carbide tips.
I carry my poles tip-up in the side pockets of my pack, and secured there by one of the side compression straps.
My ENTIRE pack then goes into a cheap, homemade draw-string top duffle bag. (out of sight helps to keeps the curious from getting that way).
If I had carbon fiber poles, I would invest in a heavy-duty mailing tube (or use the packaging in which they arrived) and check them separately. CF can't take sharp shocks at 90° to the fibers, and baggage gets tossed around a LOT.
At my destination, the duffel or the tube could be (1) discarded and re-purchased when it was time to go home, or (2) shipped ahead to trail's end for reuse, or (3) as an absolute last resort, carried with me.