Since its founding in 1994, Amazon has been massively disrupting the retail world. Over the years, they’ve increased their delivery speed to the point where they now offer free 2-day shipping with Amazon prime. They are also beginning to push their on-call delivery service, Prime Now, which is currently available in 20 metro areas.

For several years now, Amazon has also been indicating that they intend to begin using drones to deliver products. Founder Jeff Bezos said back in 2013, “One day, Prime Air vehicles will be as normal as seeing mail trucks on the road today.”

But even though Amazon has been discussing drone delivery for upwards of three years now, they still have not put the program into action.

What will the future of drone delivery look like for Amazon? It’s hard to know precisely because the company is notoriously secretive. However, we can make some educated guesses