I had signed up with NCL to book us to Miami for our Feb. cruise. They slotted me with Jet Blue, to Ft. Launderdale $548 total, in coach. Plus, play for luggage.
I called and cancelled, got Delta in first for $407 to Miami, both of us, using my companion ticket.
Not a long flight so being in first is not a big deal at all.
Being cheaper is better, and not paying for luggage is better, and getting FF miles is fine with me. I'm PT on Delta, might not be next year.