Which publication provides the most comprehensive information on a given public-use airport, including communication frequencies and services available?

Why: The FAA study guide states: "The Chart Supplement U.S. (formerly Airport/Facility Directory) provides the most comprehensive information on a given airport. It contains information on airports, heliports, and seaplane bases that are open to the public."

• Reads the superlative backwards: the source identifies the Chart Supplement, not the sectional chart, as providing the most comprehensive airport information, even though the sectional does carry basic airport data too.
• No document in this phase's source material describes the AIM as an airport-information directory; the source identifies the Chart Supplement U.S. as the comprehensive per-airport reference.