Ping Pong Balls not allowed on airplane?

Have not heard of any such restriction. Had been travelling within Canada for last 6 months and carried few balls with me everytime. No issue even when they opened the bag and checked it. Security checked the racket and balls and put it back. I doubt there is any reason for concern.

I had 6 dozed taken from my carry on. That is one flight out of 10. No way to be sure. I put them in my checked baggage now. Still not sure. If they see the outline on X-Ray, they will check to see what the balls are.

Flew from Charlotte to Indy and back and did not have problems either way. They didn't even take the ball or the paddle out of the case. I can see why more balls would be a problem as they could be a fire hazard or a fire promoter in case of a fire.

With this new 3D Scanner security technology, it's not your TT balls you should be worried about.

Those TT balls may be OK.

Hookshot wrote: They wanted to know why the X-Rays did not show wood. It must have been the carbon layers.

Not sure what the rules are for passenger flights, but they are considered "aerial detonators" for freight.  Best wishes.

My fear is that there will be cases of people and airport employees who aren't familiar with table tennis equipment and will be dumbfounded when they see them for the first time. e.g. in their minds when people play pingpong they only need 1 ball. They haven't seen people train with multi balls - hence their "possible danger" sense will trigger and will take your multiballs away if they see it in your luggage.