I spent about $23 an hour for Frontier Airlines' premium class. I'd upgrade again, but only on one kind of flight.

Ultimately, upgrading to Frontier's UpFront Plus worked out for me on this flight. Ash Jurberg I paid $159 for Frontier's Business Bundle, which included an upgrade to UpFront Plus. The upgrade didn't come with much, and my seat was fixed in a slightly reclined position. Still, I liked having an…