I have a mixed itinerary flight booked on airtran with rewards credits that leaves LAS-DEN at 0555 am southwest on a tuesday. It then goes to CUN on airtran.
I want to try to use the two business class upgrades I have from the credit card, so I know I need to call in. My research indicates that I can call in at 12:01 (1 minute after midnight) on sunday night/monday morning. Is that correct?
And what time zone? My time zone, the time zone the flight leaves from (denver), or the time zone of wherever their service center is?
1-800-AIR TRAN is who I call?

Second question - My understanding is I can't book early bird check in for the southwest portion - so the only way I can get good boarding without elite status is to wake up at 0555 AM and check in on airtran.com?
There has to be some way to avoid calling at midnight for the airtran and then having to set an alarm for 6 hours later to check in for the southwest portion. And then repeat this for the flight back from mexico……

thanks in advance