In an image taken of a test flight, an Amazon Prime Air drone carries a package. The online retailer could begin 30-minute deliveries within four to five years, CEO Jeff Bezos told 60 Minutes Sunday. Amazon hide caption

itoggle caption Amazon

A handout picture shows Europe's biggest drone, Eurohawk, made by Northrop Grumman, at the start of its first test flight in Manching, Germany, on Jan. 11. If European officials have their way, the European Union will have its own drones within the next decade. Cassidian /DPA /LANDOV hide caption

itoggle caption Cassidian /DPA /LANDOV

A federal drone that's used to patrol the U.S.-Canadian border. U.S. Customs and Border Protection/AP hide caption

itoggle caption U.S. Customs and Border Protection/AP

Drones can provide information about temperature, humidity and pressure that current radar systems can't provide. Above, the Talos drone, which has a 15.5-foot wingspan. Jamey Jacob/Oklahoma State University hide caption

itoggle caption Jamey Jacob/Oklahoma State University