What JBLU does with DFW, DTW, and ORD is completely different than what Spirit intends/intended to do. Simply, Spirit does not know how to compete in non leisure markets against legacy carriers, so they decided to take staffing out of non leisure cities and put them in leisure cities, they are a 1 trick pony.

Main question is; does JBLU see a market in non leisure cities to grow and go up against legacy carriers or will they continue to saturate the Florida market and Northeast? Being that they have stated the first part of that question is in fact, their plan, and the second part of the question is not possible because of lack of space, I would guess JBLU plans to grow/keep some of the displaced NK markets. Do they keep DFW and IAH? Who knows. But what I do know if they need bases in the central US with the forecasted size, there is no more room in the NE and Florida for more crews, they have stated that. They have also said LAS will remain to have aprox the same amount of flights as JBLU and NK operates currently, so LAS would probably remain the same. LAX will probably become a NK base this year and JBLU will combine the base day 1 with theirs. I doubt any new bases will be added from this point on that JBLU doesnt give a blessing to.

But I think its shortsighted to look at what NK has done and assume that JBLU will take the same action; they are 2 different airlines with different clientele and brand. Basically "past performance is not indicative or future results"