Anyone that thinks a 500+ airplane combination of Frontier and Spirit is better than the JetBlue deal needs to reevaluate.

https://www.denverpost.com/2023/07/21/frontier-airlines-lawsuit-hidden-fees/

ULCC will never be in the USA what it is in other parts of the world. Americans want it all without paying for it. But if you roll it into the price they will still pay for it. They hate ala carte. It’s kind of like free shipping. My wife pays for shipping all the time yet refuses to pay for anything labeled as shipping cost.

If you have more than 5 years before retirement then currently JetBlue is the best option for the long term viability of this airline and also the best chance for legacy money.