A new joint venture between Uber’s Serve Robotics sidewalk delivery drones and Alphabet’s Wing flying drone service will do a dual test run. Both tech companies hope that flying and sidewalk drones can cover areas its counterpart can’t and speed up delivery times.

Drones and sidewalk delivery robots promise to make last-mile delivery cheaper and more efficient, but they both have their limitations. Drones have

The Alphabet unit, which started as a project within incubator Google X, has completed more than 400,000 commercial deliveries across three continents, Woodworth added. Reporting by Akash Sriram in Bengaluru;

Serve Robotics, which delivers food for Uber Eats using sidewalk robots, said it would partner with Alphabet-owned Wing Aviation to use drones, extending the operational range to more than six miles.

In the coming months, select Wing deliveries will be picked up by a Serve robot from a restaurant curbside and delivered to a Wing drone AutoLoader a few blocks away for aerial delivery to customers.

Serve Robotics ($SERV), known for using sidewalk robots to deliver food for Uber Eats ($UBER), announced a pilot partnership with Alphabet-owned