Is there an app for..

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I am going to be on a really long flight later this week and i recently heard that i may not have wifi during the flight because it is going to asia and i am using united airlines.Is there an app that allows you to rent movies and tv shows and then watch them later without wifi? I know apple has this but i was looking for a cheaper service and one that has tv shows.I am using my iphone.And does it pay with paypal or itunes?thanks so much