Frontier Airlines flight 1674 makes emergency landing at Raleigh ...
I just flew on Frontier from Iowa to SFO yesterday. Can't recommend Frontier. The seats are small and cramped, don't recline and the flip-down trays on the Airbus are tiny half-size things, no TV, no snacks or free anything. The seat bottoms are so small that they stop well short from your butt to knees, and space under seats for carry-ons is small so that intrudes into your space for feet, less seat space allowing more passengers per plane. Guy next to me kept intruding on my space with his feet, knees and elbows. I started sniffling and coughing towards him, and that got him to stop intruding.
No unwelcome smells, but if there were then I can see passengers going nuts from already being squeezed on an uncomfortable long flight.