Southwest, as far as I can tell, doesn't change rates once they've published. Three rate tiers, optional early check-in to get a better boarding order position, and free baggage. The most striking difference is that, in general, the flight attendants are happy . They smile. They joke around. Sometimes they sing songs. I was on a flight a few months ago where the entire plane played a game because it was someone's bir…
I'm not 100% sure it is "legal", but I had the pleasure of flying on southwest with them half-singing half-joking throughout the mandatory safety stuff.. it was a pretty hilarious change of pace. Unfortunately, Southwest, though fairly cheap for where I go, has 2 stops minimum no matter what where as everywhere else can make it 1 stop
I initially cringed as the attendant started talking on the the mic and making a joke, as any world weary traveler probably would. I soon found myself laughing as the rest of the crew joined in with mimes and singing and call backs. It was definitely one of the best flight experiences I've ever had.