management, of the air carrier with respect to the plan required under subsection (a), which shall include training on de-escalating hostile situations, written protocols on dealing with hostile situations, and the reporting of relevant incidents. (d) Study Not later than 180 days after the date of enactment of this Act, the Comptroller General of the United States shall— (1) complete a study of crimes of violence (as defined in section 16 of title 18, United States Code) committed against airline customer service representatives while they are performing their duties and on airport property