How to watch a movie on tablet?

I have a samsung tablet or ipad. I have netflix streaming subscription. I also have DTV, premium or platinum whichever they call it now. How do I get a movie stored to watch in airplane mode?

Not sure of DTV but pretty sure you can not do it on Netflix …only a streaming service does not allow downloads, maybe someone will come along with better news because I’m not 100% sure. We rent from apple and use that

Does anyone know if i can stream Netflix on free Southwest WiFi?