ANC is missing because the service is seasonal and there is no AA flights to ANC during the time period covered by the timetable. Service resumes quite late (June 1 if I remember correctly, and right now it looks like ORD-ANC will not resume, only DFW-ANC and maybe STL-ANC). The CX Planner omits it as it isn't a Oneworld destination; it isn't an error.