Netflix and Amazon Video both have vast streaming libraries. But for travelers and those with slow Internet connections, Amazon's offline viewing feature gives it a distinct advantage.

That might change, according to Netflix's Chief Content Officer, Ted Sarandos, who told CNBC on Wednesday that his company is working to add the ability to download TVs and movies for offline viewing.

Sarandos offered no details or time frame for when it might be available, and he alluded to Netflix's belief in the ubiquity of high-speed Internet as a reason for the company's reluctance so far to add offline viewing. Netflix is sticking to that belief in countries like the US, Sarandos said, but as it expands abroad, it is targeting users with slower Internet connections.

"We still think for the developed world our thesis has been true but I think as we get into more and more [of the] undeveloped world and developing countries that we want to find alternatives for people to use Netflix easily," he told CNBC.

A Netflix spokesperson did not immediately respond to a request for comment.

Amazon became the first online streaming service to support offline viewing when it launched the ability to download select movies and TV episodes from Prime Video to iOS and Android devices in November 2015. In contrast with Netflix, Amazon initially only offered the option to viewers in developed countries like the US, Germany, and the UK.

Amazon also announced a partnership with JetBlue Airways last year to bring its streaming video to commercial flights, eliminating one of the few places that Americans previously couldn't get the bandwidth to stream even if they wanted to. Netflix has a similar partnership with Virgin America.

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