Amazon's delivery drones are so loud they are like a 'giant hive of bees'

• Amazon faces pushback from residents in Texas, where it's testing its delivery drone program.
• Residents are complaining about the level of noise as Amazon seeks to expand the project.
• Amazon's Prime Air drone program wants to increase flights in the area from 200 to 469 a day.

Amazon's delivery drone robots once seemed like a futuristic joke. But now, as the company seeks federal approval to expand its drone program, it's facing a fundamental challenge: They're too loud.

Drones are generally loud machinery. Anyone who has tried to relax on a beach while someone flies their drone can relate.