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It sounds like science fiction, but more and more fast food companies are offering innovative food delivery methods, including drones, robots and chatbots.

KeyBanc Capital Markets analyst Chris O'Cull said in a research note Friday that delivery is the fastest growing segment in the fast food industry.

O'Cull said, using KeyBanc's restaurant delivery tracker, that certain fast-food restaurants are seeing "the largest quarter-on-quarter net adds" for the first quarter due to their delivery options.

Here's a look at some of the biggest companies leading the charge.