You’re on the plane I was talking about in my earlier post (#34) the 737-900 acquired by Lion Air. I have been on those numerous times. Absolutely safe - nothing wrong with it, I just don’t like the one row of C+ and lack of in seat entertainment.
ATL was hit hard with weather delays today. Equipment swaps are normal. A pain for passengers and gate agents, but it beats waiting for the plane that was supposed to take that route and had to divert because of storms.
Yes, you absolutely should be compensated for the change. Send them a text.