I like Southwest Airlines! Specially when we fly to Vegas! It's the cheapest when you make your reservations in advance! It's basically a flying taxi..
The only thing I don't like is you can't get assigned seats and if you are running late, most likely you will end up with separate seats from your partner! We have flew on this airline over 25 years and lately all flights are full so register 24 hours before your check in! And if you are a yelper, then don't forget to check in here as well!!