Class B airspace refers to airspace within a few miles of a major airport and it is both dangerous and illegal to fly a UAS in that airspace.
Source: VICE Motherboard
Tuesday, the Federal Aviation Administration hit a Chicago-based aerial photography company with an unprecedented $1.9 million fine for flying drones unsafely over the course of some 65 unauthorized flights in crowded airspace. For many drone pilots, the news was unexpected and raised two important questions: How did the FAA conduct its investigation, and are there more fines coming?