Originally Posted by
AlpineSFO
Also, just found this on the site linked from Twitter (united.com/meetthefleet) under the Inflight entertainment and WiFi:
You can enjoy your favorite movies, TV shows, podcasts and curated playlists with seatback entertainment in every seat and over 2,800 selections to choose from. Plus, you can easily connect your wireless headphones with Bluetooth technology. Still can’t find something to watch? Just purchase Wi-Fi on board to stream videos from your favorite online services.*
*Bluetooth is only available on our new 737 MAX and A321neo aircraft, and streaming services are only available on aircraft with the industry’s fastest Wi-Fi.
If the WiFi is fast enough for streaming I wouldn't be surprised to have Amazon or Netflix eventually lock up a deal for free streaming to their services