The objective of the Phase II work is to develop a generic, advanced Flight Management System (FMS) for the evaluation of autonomous 4D-trajectory based operations (4DTBO) concepts. The work will address the following limitations of most commercially available FMS: they have limited advanced features; are specific to a single aircraft type; and cannot be readily modified by researchers. The proposed research will identify and extend advanced FMS features for the simulation evaluation of 4DTBO concepts in different phases of flight, based on the feasibility demonstration during Phase I work. Some of proposed feature include (i) advanced 4D guidance modes such as Required Time of Arrival (RTA), 4DFMS, and Interval Management (IM), (ii) high-fidelity wind modeling and wind update capability for improved predictability, (iii) trajectory negotiation, (iv) optimal 4D trajectory planning. Phase II work will develop a generic FMS interface to NASA's Multi-Aircraft Control System (MACS) to enable the evaluation of FMS modules from multiple vendors in 4DTBO simulations. The proposed FMS platform and the generic FMS interface will allow the users to deploy a wide array of autonomy enabling FMS features through a Graphical User Interface. All the algorithms and software developed under this research will be delivered to NASA at the end of the project.