Methods and systems for flight control of a supersonic ownship are provided. The systems utilize sources of weather data, a flight management system (FMS) of the supersonic ownship, and sources of neighbor traffic data. The systems generate a complete neighbor traffic flight trajectory, and then process the complete neighbor traffic flight trajectory with a flight plan of the supersonic ownship, aircraft specific parameters, and forecasted and real-time weather data to generate therefrom a safe sonic altitude for flying the supersonic ownship. The safe sonic altitude is transmitted to air traffic control (ATC) as a request for an assignment. Upon receiving the assignment from ATC, the systems notify the pilot of the assignment and continue monitoring airspace for real-time changes in the flight path trajectory of the neighbor traffic. The sonic altitude is updated based on a detected real-time change in the flight path trajectory of the neighbor traffic.