There are a number of challenges for drone delivery. For starters, the drones have to be designed well enough to not crash. They also have to be able to handle wind. Rain can also be problematic. Further, companies who use drones will have to figure out whether they will have the drones land, or simply drop off the package. Each method requires different approaches,
What is the central idea of this passage?*
Drones have problems with wind and rain
Drones have a major problem with crashing.
There are many obstacles for drones to overcome before they can be used to deliver items
There is a difference between drones that drop off packages and drones that have to land.