A couple of things I didnt see in the post were:
*What are the dates you are going and for how long.
*Are you flying on a preferred US carrier for points/miles (?)
*Do you have to fly out of Nashville ? Its a 4 hour drive to ATL - It may be cheaper to overnight and leave from there ?
*Are you taking a rifle with you ? Some airports are better at clearing guns without a TSA hassle than others. (Newark, O'Hare, Atlanta come to mind as being the worst).
I fly almost every week for work domestically, IAH is a complete s**t show right now. Anything less than a 2 hour connection and you may be running for your life to catch a plane. SFO has remodeled since Covid and is a wonderful airport to fly out of or get a connection. LAX can fall into the Pacific along with the rest of SoCal and it wont be missed. Given my options for a hunting trip I'd rather fly out of DFW if given a choice.
Various wars/conflicts have caused oil/gas prices to skyrocket oil is up from ~$70 barrel pre Iran conflict to ~$100 barrel this week. Airlines added a fuel surcharge/upcharge a while back and haven't reduced it.