Systems and methods for a non-integrated CPDLC solution are provided. In one embodiment, the system includes: a first and second computing system for respectively executing a first and second CPDLC application; a Human Machine Interface coupled to the first and second computing systems, the Human Machine Interface providing access to display screens generated by both the first and second CPDLC applications; and a data authority function that determines a data authority application from the first and second CPDLC applications based on which of the first and second CPDLC applications has a current data authority (CDA) session. The data authority function prevents the first CPDLC application from establishing a concurrent current data authority session when the second CPDLC application is the data authority application. The data authority function prevents the second CPDLC application from establishing a concurrent current data authority session when the first CPDLC application is the data authority application.