Check check and RECHECK!! we booked our flights for nonstop JFK-SXM back in MARCH last year for this Jan.

We went from confirmed seats,
then an equipment change with no confirmed seats,
then a swap back to a 3rd a/c with confirmed seats.....so I check our seats once a week.

I think the changes were more this year with the US merger. should settle down. But makes one want to consider JetBlue more and more.