; and (3) the feasibility of expanding the pilot program to additional airports, including to medium and large hub airports. 1921. Authorization of appropriations; exit lane security There is authorized to be appropriated to carry out section 44903(n)(1) of title 49, United States Code, $77,000,000 for each of fiscal years 2019 through 2021. 1922. Real-time security checkpoint wait times (a) In general Not later than 18 months after the date of enactment of this Act, the Administrator shall make available to the public information on wait times at each airport security checkpoint at which security screening operations are conducted or overseen by the TSA. (b) Requirements The information described in subsection (a) shall be provided in real time via technology and published— (1) online; and (2) in physical locations at applicable airport terminals. (c) Considerations The Administrator shall only make the information described in subsection (a) available to the public if it can do so in a manner that does not increase public area security risks. (d) Definition of wait time In this section, the term wait time means the period beginning when a passenger enters a queue for a screening checkpoint and ending when that passenger exits the checkpoint. 1923. GAO report on deployment of screening technologies across airports (a) Study The Comptroller General of the United States shall conduct a study whether the TSA allocates resources, including advanced imaging and computed tomography technologies, appropriately based on risk at Category X, I, II, III, and IV airports at which security screening operations are conducted or overseen by the TSA. (b) Cost analysis As a part of the study conducted under subsection (a), the Comptroller General shall analyze the costs allocated or incurred by the TSA at Category X, I, II, III, and IV airports— (1) to purchase and deploy screening equipment and other assets, including advanced imaging and computed tomography technologies, at Category X, I, II, III, and IV airports