Regarding Chalks....
Most of their flights are very short anyway so not carrying on board anything shouldn't be much of an issue. I'm sure they'd let you take a book or camera bag on board, just probably not a regulation-size rollaboard. They fly seaplanes, much different deal than the average airliner. They do have regular security checks when they fly into actual airports, such as FLL. Otherwise, they are just pulling up onto a driveway coming out of the water to disgorge passenger. Also as far as the security checks... they are flying small aircraft. There are larger general aviation aircraft sitting at airports with zero security or people around.