With the mako rubber weight belt & pinch weights, all I have to do is bring all the weights with me on the flights.
Due to having to have out gear checked in on flight and trying to limit out combined gear to 50 LB, I got a BP that is made out of aluminum. I use whatever tank they have (usually alum), and adjust my weight appropriately. I frequently don't use floats with my camera and it becomes quite negatively buoyant, thus I think I had dives when I used only 4# of weights. I usually wear 3mm, and my wife will alternate between 3mm, 3mm shortie and layering both, all on the same day.
I only shared this BC with her because I didn't have time to switch over and test my octo/inflator. Neither did I have time to switch over her quacker, but I just switch over my shaker to her BC. We are not going to bring 3 BCs on trips and take turn using this one, one of us will use this permanently and, depending if she liked it enough and/or if I want to keep my well worn BC going with elbow grease....or get another of the same, depending on the weight system situation.