Abstract: Techniques for enforcing stratified aircraft security are presented. The techniques are performed using an aircraft-based authentication and authorization unit and a wireless transceiver, where the authentication and authorization unit includes an electronically stored machine learning classifier. The techniques include: receiving and verifying authentication data for an employee from a mobile access device; receiving employee data from the mobile access device, the employee data including at least information representing an access event of the employee with the aircraft; providing an input to the machine learning classifier, the input including at least aircraft data and the employee data; obtaining an output from the machine learning classifier, the output indicating a level of access authorized; and providing an alert in response to a level of access by the at least one employee for the access event exceeding the level of access authorized.