Add me to the list of those who don't carry on dive gear other than computer and mask. I separate the wing and plate, lay the plate on the very bottom of my checked bag, then layer wetsuit on top of the plate, then regulators, then some clothes, and finally the wing laid on top. The wetsuit and clothes act as padding.
When I first started travel diving, I dutifully took the regs in my carry-on. However, it has since occurred to me that worse comes to worst I can rent regs, just as I can rent a BC. What if the BP/W disappear with a lost bag?--am I still going to use my 7'-hose reg set with a rented jacket BC? Probably not. Even if I could carry plate, wing, regs, mask, computer, etc., ALL in a carry-on, then that would leave me with a checked bag with nothing but a few t-shirts, shorts, bathing suits, toiletries, etc. If I'm traveling with an airline that gives me a free checked bag, I'm going to use it to the fullest.