I had to book a round trip to Vegas with work a few weeks back. Had to book Frontier and they don’t allow changes without a steep cost, plus they do not fly to Albany where I need to now go to see family.

On my home, I fly Vegas-BNA-MCO. My plan is to get off in Nashville and take a Southwest flight to Albany. I just realized that when we stop at BNA, there isn’t a flight change. Will I be able to get off to make my other flight? Are they going to hold up the plane because I won’t still be on the flight? I obviously plan on telling the flight attendants my situation and I will only have a carry on.

Also, it says we land in Nashville at 1:27 and leave at 2:15, so it will be a quick turnaround...however don’t they have to still let Nashville passengers off the plane?

Of course.

Your plans changed, Happens thousands of times a year. Just get off in Nashville when everyone else does. They cant FORCE you to stay, and they won't know or care if you're flying on another airline.

Your bags, if you checked any, are a different story. They will go to your ticketed destination Orlando without you. Best option is to not check anything.