The reason the FAA has been so cautious with drone regulations is that commercial drones can be incredibly dangerous to low-flying aircraft. Pilots have reported more than 650 close calls with drones so far this year, a massive increase over last year’s cases. According to a statement that the FAA released earlier this week, there were only 238 of these reports in 2014, which means that number has more than doubled and 2015 isn’t even over yet.