title: Is Sabre Central / Tulsa time zone a subject of daylight saving?
body: <p><a href="https://formatfinder.sabre.com/Content/PassengerNameRecordPNR/OverviewPassengerNameRecordPNR/DateandTimesStampsinPNROnline.aspx?ItemID=78350f0205bb4cf592c533c2c7a1d7a0" rel="nofollow noreferrer">Official Sabre docs</a> states that PNRs creation, history and fare date/time in:</p>
  
  <blockquote>
    <p>Reflects Tulsa time (Always in Central Time - CT).</p>
  </blockquote>
  
  <p>Is it <code>America/Chicago</code> IANA TZ (so <code>ZoneId.of("America/Chicago")</code> for Java)?</p>
  
  <p>Is it subject of daylight saving (so UTC-05 in summer and UTC-06 in winter)? That means ambiguity at 1AM when time goes back one night in autumn (from 2AM to 1 AM)...</p>