I advise checking the poles. I collapse mine and either put them in the rucksack with stuff around them, OR I attach them to the side of the rucksack, under the compression straps. In six Camino trips, traveling back and forth, from the US to France and Spain, I have never had a problem.
NOTE - if you can disconnect the compressed shaft segments so they are parallel, the overall length is about 2 - 3 inches shorter. You can do this with traditional 'twist-tighten' poles and some flip-lock poles. My Black Diamond carbon fiber Z poles to not come completely apart...or at least I have not yet figured out how.
If you are traveling with a spouse or S/O, consider combining checkable items in one rucksack, then share the carry-on capacity of the other, smaller rucksack. "Checkable items" include the: hiking poles, pocket knives; liquid, pastes, or gels larger than 3 oz.; and anything else you do not need on landing.
Wear your hiking boots enroute to save weight and ensure that, if the worst happens and you happen to lose your rucksack, at least you have your broken in boots or shoes.
Also, I always use a Sea to Summit 16-liter Sling Bag as my carry-on for enroute travel. it holds all my valuables, medications, documents and electronics, plus on change of undergarments and a t-shirt, "just-in-case." Once I am on Camino, it rides in a rucksack waist pocket. When entering a town, it becomes my possibles bag" for shopping, laundry bag, and day-off touring.
Hope this helps.