Really this argument again...

Do you realize how many different factors go into ticket pricing. So right now,
Delta
abc to xyz for $100
Spirit
abc to xyz for $199

"Ohhh Spirit isn't the cheapest!!"

No Spirit is not always the cheapest, lots of times we are. But in this example so many cost factors could be involved. But the major one is this... Maybe at this point Delta has 80 of 140 seats open while Spirit only has 8 of 178 open. Spirit can afford to keep the price high while Delta catches up.

Last year I bought a ticket from ATL to the Islands down south on Delta. 3 months prior with almost 70 seats open, the one way cost me $180. 6 WEEKS PRIOR, I had to get an additional ticket for someone else, guess what... only 5 seats showing available in coach, price was $1100 one way!!

So doing this "oh look at this route" or "They are not cheaper here" is just asinine. Some where out there (I don't care enough to find it, I'm surprised I even wrote this long of a response) there is an official number provided by some official source of the average ticket price per airline on a given route. Spirit is the cheapest a lot, not all, of the time.