; and (4) continue to conduct both regular routine and threat-specific classified briefings between the TSA and appropriate transportation sector stakeholders on an individual or group basis to provide greater information sharing between public and private sectors. (c) Mass notification The Administrator shall encourage security stakeholders to utilize mass notification systems, including the Integrated Public Alert Warning System of the Federal Emergency Management Agency and social media platforms, to disseminate information to transportation community employees, travelers, and the general public, as appropriate. (d) Public awareness programs The Secretary, in coordination with the Administrator, shall expand public programs of the Department of Homeland Security and the TSA that increase security threat awareness, education, and training to include transportation network public area employees, including airport and transportation vendors, local hotels, cab and limousine companies, ridesharing companies, cleaning companies, gas station attendants, cargo operators, and general aviation members. 1933. Airport worker access controls cost and feasibility study (a) In general Not later than 1 year after the date of enactment of this Act, the Administrator, in consultation with ASAC, shall submit to the Comptroller General of the United States and the appropriate committees of Congress a study examining the shared cost and feasibility to airports, airlines, and the TSA of implementing enhanced employee inspection measures at all access points between non-secured areas and secured areas at a statistically significant number of Category I, II, III, IV, and X airports. (b) Assessment To the extent practicable, in conducting the study, the Administrator shall assess the cost, operational efficiency, and security effectiveness of requiring all employees to present for inspection at every access point between non-secured areas and secured areas of airports, and of deploying some or all of the following screening measures