In which FLIP publication can you find information concerning customs availability?

The Foreign Clearance Guide and FLIP Enroute Supplement are the appropriate references for finding information regarding customs availability. The Foreign Clearance Guide provides detailed information about the entry and exit requirements for foreign countries, including customs regulations and procedures, which are crucial for any international flight planning. This publication assists pilots in understanding the local customs policies they need to comply with when landing in foreign nations.

Additionally, the FLIP Enroute Supplement contains data on airports, including available services and customs facilities, enhancing situational awareness and aiding in planning. Together, these resources provide comprehensive customs-related information necessary for flight crews operating internationally.

The other options do not specifically address customs availability. The Flight Information Handbook is primarily focused on domestic flight operations, regulations, and procedures. The Aviation Safety Manual deals with policies related to aviation safety but does not provide customs information. The Operational Procedures Guide outlines procedures for operations but lacks specific details on customs regulations. Thus, the Foreign Clearance Guide and FLIP Enroute Supplement are the definitive sources for customs information.