Providing user authentication services using biometric hardware and software technology, bar code technology, short-range wireless communication technology, block chain technology, pass-phrase technology, cryptographic based protocols, or single sign-on technology for in-person transactions and for ingress and egress at secure areas such as security checkpoints within public or private facilities such as airports and to public or private modes of transportation within or at such facilities

Airline passenger security screening services; Security screening services, namely, verifying the identity credentials of passengers for public health, safety, and security purposes; Identification verification services, namely, verification of identity credentials of passengers for public health, safety, and security purposes