; (B) the development of an information-centric national airspace system, including digitization of the processes and technology that supports such system; (C) improving the interoperability of FAA systems and third-party systems that support safe operations in the national airspace system; and (D) developing and periodically updating an integrated plan for the future state of the national airspace system in coordination with other offices of the FAA. (b) Integrated plan requirements The integrated plan developed by the Office shall be designed to ensure that the national airspace system meets future safety, security, mobility, efficiency, and capacity needs of a diverse and growing set of airspace users. The integrated plan shall include the following: (1) A description of the demand for services that will be required of the future air transportation system, and an explanation of how the demand projections were derived, including— (A) the most likely range of average annual resources required over the duration of the plan to cost effectively maintain the safety, sustainability, and other characteristics of national airspace operation and the mission of the FAA; and (B) an estimate of FAA resource requirements by user group, including expectations concerning the growth of new entrants and potential new users. (2) A roadmap for creating and implementing the integrated plan, including— (A) the most significant technical, operational, and personnel obstacles and the activities necessary to overcome such obstacles, including the role of other Federal agencies, corporations, institutions of higher learning, and nonprofit organizations in carrying out such activities; (B) the annual anticipated cost of carrying out such activities; (C) the technical milestones that will be used to evaluate the activities