Sonora stopped observing DST last year

To follow up on my previous message, I found a Usenet article from an unidentified source saying that Sonora stopped observing DST last year. I think my next proposed change will add the following comment to the tz data, along with a new zone America/Hermosillo. # From <mga707@my-dejanews.com> in <news:7e9kp7$1gq$1@nnrp1.dejanews.com> # (1999-04-05): # This year the Mexican state of Sonora opted not to go on Daylight time, # so as to remain on the same time as the neighboring state of Arizona. # The two Nogaleses will be on the same time! I still haven't found a confirmation of the IATA's report of changes to the time zone in Atyrau, Kazakhstan.