Published: Mar 1, 2004 - Production Software

Why are time-zones NOT shown on some entries? eFAD provides time-zone information in one of two ways: a. time-zones are provided to us via the DAFIF database b. time-zones are calculated based on state where the airport or NAVAID is located. States that span multiple time-zones (such as Texas) AND are NOT provided in the DAFIF database will NOT be shown. Time Zones that contain a * entry are calculated using method (b).

http://www.pspda.com/blog/efad_why_are_some_timezones_not_shown.html