A system for aircraft communications comprises an avionics processing unit onboard an aircraft, and a computing platform onboard the aircraft and in operative communication with the avionics processing unit. The computing platform hosts at least one application and one or more aircraft navigational charts with Air Traffic Control (ATC) center identifying information. An aircraft data network is also in operative communication with the computing platform. The avionics processing unit is operative to receive an ATC center facility designator input by a user or from another onboard avionics system, and to transmit the ATC center facility designator to the computing platform. The application is operative to query the aircraft navigational charts based on the ATC center facility designator to obtain corresponding ATC center identifying information, and to send the corresponding ATC center identifying information to the avionics processing unit.