Blue and Blue Plus have not changed (I think). Blue Basic is completely no frills even boarding last. Blue Extra is the Cadillac. For what it’s worth I checked our dates in July and they aren’t offering the new fares on the JFK-SXM route.

I don’t know what the fare difference will be, but I’d have to be pretty hard up to go Blue Basic and risk forfeiting the fare completely if I had to cancel or reschedule.