Empty seats on jetBlue

I thought I’d never see an empty seat on a long haul jetBlue flight, and this is precisely what we discovered when we flew back from New York to Salt Lake. There were actually several empty seats, and a very welcome one between Evelyne and me. This flight is very popular and every time anyone we knew took that flight, it was packed.
Is it a sign that the low-cost carrier popularity has peaked or that the last Valentine Day’s fiasco when passengers were stuck in the planes for over 10 hours at Kennedy Airport deflated the company’s loyalty bubble? I guess the future will tell, but in the meantime, it’s perfectly possible to expect empty seats on jetBlue.