Registered Traveler Act of 2020 This bill provides statutory authority for a registered traveler program of the Transportation Security Administration (TSA). (The registered traveler program authorizes an airport operator, with TSA approval, to enter into a contract with certain private entities to provide registered traveler services to program participants.) Registered traveler services include (1) identity verification, (2) traveler vetting status authentication, (3) access to physical screening, and (4) other additional services at the airport security checkpoint as the TSA may approve. The TSA must (1) develop policies, procedures, and capabilities that allow registered traveler services providers to provide program participants the full extent of registered traveler services; and (2) conduct audits of the performance of the providers, and allow the providers to correct any deficiencies identified during such audits. The TSA must also provide registered traveler services providers access to technology and information that are available to airport operators, air carriers, or private screening companies, including the TSA advanced passenger prescreening system.