I just did a search for a roundtrip LAS - MCO . depart 11-14 and return 11-18 cheapest nonstop fare.

Frontier is $220
Southwest is $560

So lets say a family of four traveling. You check one big bag on Frontier for $80 roundtrip and then do backpacks for the flight. Saving over $1200. That's a lot of money you can spend on your vacation.

I have a Delta captain friend that buys tickets on Frontier for his family instead of dealing with non rev fun.

So just saying cheap sells. Id be willing to bet most pilots on here go to Costco or Sams club.