The refit of the existing 737-800s to BYOD (no screens) is complete, and the 737-MAX8s were delivered without screens. All IFE is done through a local wifi network to your own device, and seatback device holders are installed in the back of each seat where the screens were.
Oasis removed the IFE and is complete. IIRC, Kodiak added the device holder and the USB port in the seatback, and I don't think it's complete yet. At least I seem to remember being on some 738s recently that didn't have the device holder.
Originally Posted by
KBMIFlyer
All of the inflight entertainment is all stored on the aircraft, so the only thing you should lose while not over the US would be Internet Wifi and I am guessing Live TV.
The 738s have ViaSat, and as posted above, you'll have Internet connectivity in the Caribbean and fairly far into Central America. I've found the coverage map to be a tad optimistic about coverage near northern South America.