During the Spirit trial, evidence was introduced (a board presentation) that said "Spirit is the next natural step in our longer-term goal to pursue Alaska.” I don’t think it would be unreasonable to think some kind of merger/acquisition scenario is still a consideration.

https://thepointsguy.com/news/jetblu...s-robin-hayes/

Of course our relative sizes and financial situations have changed in the last few years, so the dynamics would be different today.