When dealing with timezones of a different era how do you guys handle this when they are not the same as the current timezones as far as daylight savings time. I am working on Allegheny 1974 and as you know all of Indiana and Louisville were different then as opposed to the times zones of today. I am looking for a quick fix other than going into the airports file and changing the values.
Add or reduce the amount of time in order to match the current time zone. That´s what I do and it helped with Iran or flights to or from that country, since opposed to 2016 they had no summer time in 1989.