AirNav.com is a supplemental resource for pilots and aviation enthusiasts. The site hosts a very large number of airports' information such as runway distance, airport frequencies (CTAF, Tower, Ground, ATIS/AWOS, ILS, departure, approach, center, clearance delivery, emergency, and FSS/FBO frequencies), airport facilities and services, operations, Chart location, navigational coordinates and locations, radio aids, ownership information and other pertinent information that all pilots need when traveling into or out of an airport. The same information is published in the A/FD (Airport/Facility Directory)
Airnav has been online since May 29, 1996 [1]. Their Alexa rank is 53,785.