London Longboards

Put your board in the bag. You’ll have to check it into oversized baggage anyway, and they can wrap it for you in the airport if you really want that. I’ve never bothered.
As long as your bag isn’t big and airy and your board won’t bounce around in transit you’re golden.

Go have fun! 

When I travel, I use a big golf/kite surfing bag.
I either tie it down to the bottom so it doesn’t roll around and put it in a bin bag so the dirty grip and wheels don’t ruin your clothes.
Or put in the middle of lots of clothes so it doesn’t roll around when it’s in transit. The 2nd option is for when I’m taking my slalom board in a medium sized bag.
Do not attempt to take your board unto the aircraft, most airlines will laugh as they take your big toy away from you.
I can’t really recommend any brands of board bags but there are some great companies making bespoke longboarding bags which makes this whole process much easier. Watch this space, I may be trying one on my next adventure so I’ll be sharing details here.