In the interest of aviation safety, all airport owners/managers are encouraged to frequently update information about their airport. Airport information is constantly changing and we update our Airport/Facility Directory data every 56 days. If you are the airport owner/manager and need to add, delete or modify your airport information, contact the local Flight Service Station or Aeronautical Information Services, ATA-100, at 1-800-457-6656. The FAA Specialist will verify your airport information and publish a change in the National Flight Data Digest. The new or revised data will generate a change to the Airport/Facility Directory. NACO uses the National Flight Data Digest as a source document to modify information in the Airport/Facility Directory and alert the flying public about your airport information for the next publication cycle.