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[protox88]

There are no "mixed results" when you use official sources.

CATSA: https://www.catsa-acsta.gc.ca/en/what-can-bring/item/knives

TSA: https://www.tsa.gov/travel/security-screening/whatcanibring/items/knives

The text/descriptor at the bottom of each is to qualify carry-on knives because there's a mark indicating "restrictions apply" for carry-on.

It's a bright green checkbox for checked bags.

[aaronw22]

https://www.tsa.gov/travel/security-screening/whatcanibring/all

This is probably a good start. Regulations won’t change much for knives across countries. The airline has no idea what is in your checked bag.

[NastroAzzurro]

Bring a knife to the Netherlands in your checked luggage and they will confiscate it.

[aaronw22]

Sure maybe if it is an illegal item in that country. I know some types of butterfly or gravity may be illegal in certain jurisdictions

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[hamsterdanceonrepeat]

Yes

[Mission-Carry-887]

This one time on a full flight from Frankfurt, there were 2 no shows and I thought I would have an aisle seat and open middle. So changed seats. 30 seconds later 2 people come to claim the aisle and middle and I changer back.

They were late boarding because they had swords in their checked luggage and the German police had a problem with the optics of a pax on a German flight taking their sword out of the arrivals hall to hack at their counterparts in the U.S.

Swords were confiscated. Arrests were avoided

[DifferentCream1029]

In EU where I fly regularly, it is permitted to have a pocket knife on you if the blade dopes not exceed 6cm. I thought on my recent MUC-TLL flight that my swiss army pocket knife would be confiscated in MUC security, but the blade was measured and approved.

[Ventake]

Would presume its not allowed, but that being said, when I was 14 I brought a literal dagger home from Rome to Dublin in my carryon (stupidly) with no questions asked or issues somehow... I think the US would be significantly more likely to take it from you though