There’s a reason why unmanned aerial vehicles (UAVs) aren’t permitted to fly beyond 400 feet and within a five-mile radius from airports: they could cause a disaster if they smash a plane’s windshield or get sucked into its engine. Unfortunately, some drone operators don’t follow protocol, and their numbers have only increased since June 1st this year. According to a document that the FAA has just released, pilots and air traffic controllers have reported 175 incidents in which a drone was seen flying in restricted airspace since mid-2014. Out of those 175 incidents, 25 describe drones almost colliding with either a plane or a helicopter.