in that case, id go for it. i never tried to get the plate past TSA, did not want to deal with a hand search at the checkpoint due to the x-ray shadow. our checked gear bag has never been searched (zip tied zippers).
Cruise ship security went over our carry ons that had reg bags in them with a fine toothed comb; had to play twenty questions as they pulled each part out. not sure if because of security, or they were just curious. just don’t bring a dive knife as other's have mentioned. did not have any issues with sheers or trilobites.
after confirming with the staff it was ok, we cleaned our gear up on the pool deck under a stairwell next to the rinse showers. so much easier then in the berth. downside was that it never ceased to draw a crowd, but i always like answering questions about scuba stuff
THAT is a heck of a good idea, thanks very much. I never considered it. I was dreading using the tiny shower in the cabin.