According to government travel regulations, you can bring neither sabers nor brass knuckles on planes. The good news is that they have started allowing tweezers again. Cricket bats, unfortunately, still a no-go. Dominic will have to get his very first cricket bat from someone else.
Need more info? Here's the best itemized chart I've found: http://www.tsa.gov/assets/pdf/prohibited_and_permitted_items_10-24-07.pdf