Robert Segers, Ashley Kopman, 2022-05-26, This document describes a civil aviation, air-to-ground interaction use case for the Path Validation extension to Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS) working with the Server-based Certificate Validation Protocol (SCVP). Evidence of its use in a Gamaredon marketing campaign was flagged by a researcher as considerably back again as 2019.