Comment by kstrauser

Edge case: what would you do about Mountain Time? Check out this "fun" time zone map of Arizona where you could fly a straight line through 6 time settings in one hour: https://en.wikipedia.org/wiki/Time_in_Arizona#/media/File:AZ...

The ET/EST/EDT question is reasonable because ET is heavily populated and behaves sanely (as far as I know). Other popular US time zones are... different.