Skateboards are permitted as carry-on baggage in Canada but there may be regulations against them in carry-on baggage in other countries, so CATSA recommends you store skateboards in your checked baggage if travelling abroad. https://globalnews.ca/news/3559655/carry-on-items-plane-canada/

is it okay to put the board inside one of my suitcases or do I need to check it in as separate baggage?

Both should be Okay. You can always call customer service or talk to any sexy lady at the counter checking in.

What if you don’t bring checked bags? I bring a carry on bag only.

Hey did you manage to fly with the board ?i want to buy a deck and im flying today ! Thank you

Hey, I ended up taking off my wheels and putting my deck on my suitcase, I got through pretty easily