Google's secretive research laboratory is trying to build a fleet of drones designed to bypass earthbound traffic so packages can be delivered to people more quickly.

The ambitious program announced Thursday escalates Google's technological arms race with rival Amazon.com Inc., which also is experimenting with self-flying vehicles to carry merchandise bought by customers of its online store. Amazon is mounting its own challenges to Google in online video, digital advertising and mobile computing in a battle that also involves Apple Inc.

Google Inc. calls its foray into drones "Project Wing."  Although Google expects it to take several more years before its fleet of drones is fully operational, the company says test flights in Australia delivered a first aid kit, candy bars, dog treats and water to two farmers after traveling a distance of roughly one kilometer, or just over a half mile, two weeks ago.