Live in the Los Angles area and have done the following trips 2xBelize, 2x Grand Cayman, 3x Fiji, 1x Solomons, 1x Papua New Guinea, 1x French Polynesia, 2x Philippines. Not an expert by any means but I have found a rigid case warrantied for 1000 airlines flights with wheels and a pull-up handle, that holds all my scuba gear is just fine. Ok I pay an oversized fee and if I am careful I am under the weight limit, but often over. So I pay and carry on only my Lithium batteries in fire bags, so they pull out easy for security, my regulator, and dive computer. Nowadays my carry-on is the Ocean Reef Backpack for the Neptune III full face mask with a compartment for the 1st stage and octo etc that eaisly holds a second regulator set (just in case) and dive computer.
I take all my own SCUBA gear on every trip for the following reasons
1. I know it
2. I know when it was last serviced
3. I have seen the gear offered for rent in other places and found it all too often to present the following
A. Looks like it was made before the year 1802
B. I see too many rentals that leak or malfunction otherwise
4. I have heard a first-hand account by a friend of being at a dive shop overseas that I have also been to and he observed them using a regulator to unstop a toilet (what? stick the 2nd stage in a toilet? How is that going to work?) and then dip it into a rinse tank and hang it back up for rental!!!
Someone did recommend ACCER fins for travel, and I use them even at home.