; (2) once such technology described in paragraph (1) is available, establish a requirement for the technology to be installed on aircraft operating under part 121 of title 14, Code of Federal Regulations, landing at airports within Class B and Class C airspace and certified under part 139 of title 14, Code of Federal Regulations; (3) in establishing the requirement as described in paragraph (2), consider any relevant findings identified pursuant to section 334 of the FAA Reauthorization Act of 2018 ( Public Law 115–254 ); and (4) not later than 1 year after the date of enactment of this Act, issue to Congress a report on the progress of the work described in paragraph (1). 4. Investigations for covered events (a) In general Once implementation of section 3(a) of this Act is complete, the National Transportation Safety Board may initiate investigations of covered events to determine risk factors specific to the airport at which such an event occurred and other elements of the National Airspace System that may contribute to the cause of the event. The National Transportation Safety Board may also elect to consider multiple events in a single report as part of a special investigation or study to examine safety factors contributing to these events. (b) Content The review and analysis shall examine factors present at the time of any covered event at such airport, including— (1) challenges pilots perceive when flying into and out of the airport; (2) challenges that air traffic controllers face when working at the airport; (3) characteristics of the communications among and between groups of personnel whose work relates to the movement of aircraft into and out of the airport including pilots, air traffic controllers, maintenance workers, dispatchers, and airline airport operations personnel