Where can you find ARTCC sector frequencies and preferred IFR routes?

The preferred answer can be found in the Airport/Facilities Directory (A/FD). This publication provides a comprehensive resource for pilots looking for detailed information about airports and facilities, including data on ARTCC sector frequencies and preferred IFR routes. The A/FD presents this information in a format that is readily accessible and serves as a vital tool during planning and navigation.

The Aeronautical Information Manual (AIM) contains general flight information, including regulations and procedures, but it does not specifically list ARTCC frequencies or prefered IFR routes. The Terminal Procedures Publication (TPP) focuses primarily on standard terminal arrival and departure procedures, along with instrument approach and departure charts, which do not encompass the broader ARTCC frequency data. Sectional Aeronautical Charts provide visual representations of airspace, navigation aids, and features useful for navigation, but they do not specifically contain the detailed frequency information that you would find in the A/FD.

Hence, for finding ARTCC sector frequencies and preferred IFR routes, the Airport/Facilities Directory is the most appropriate reference.