The US government is getting near-daily reports – and sometimes two or three a day – of drones flying near airplanes and helicopters or close to airports without permission, federal and industry officials tell the Associated Press. It’s a sharp increase from just two years ago when such reports were still unusual.

Many of the reports are filed with the Federal Aviation Administration (FAA) by airline pilots. But other pilots, airport officials and local authorities often file reports as well, said the officials, who agreed to discuss the matter only on the condition that they not be named because they weren’t authorized to speak publicly. Michael Toscano, president of a drone industry trade group, said FAA officials also have verified the increase to him.

While many of the reports are unconfirmed, raising the possibility that pilots may have mistaken a bird or another plane in the distance for a drone, the officials said other reports appear to be credible.

The FAA tightly restricts the use of drones, which could cause a crash if one collided with a plane or was sucked into an engine. Small drones usually aren’t visible on radar to air traffic controllers, particularly if they’re made of plastic or other composites.

“It should not be a matter of luck that keeps an airplane and a drone apart,” said Rory Kay, a training captain at a major airline and a former Air Line Pilots Association safety committee chairman. “So far we’ve been lucky because if these things are operating in the sky unregulated, unmonitored and uncontrolled, the possibility of a close proximity event or even a collision has to be of huge concern.”

The FAA requires that all drone operators receive permission from the agency, called a certificate of authorization, before they can fly their unmanned aircraft. Most certificates limit drones to 400 feet in altitude and require that they remain within sight of the operator and at least five miles away from an airport. Exceptions are made for some government drones. The military flies drones in great swaths of airspace in remote areas designated for military use. Customs and Border Protection flies high-altitude drones along the US borders with Mexico and Canada.

Jim Williams, who heads the FAA drone office, caused a stir earlier this year when he told a drone industry conference that an airliner nearly collided with a drone over Tallahassee, Florida, in March. The pilot of the 50-seat Canadair Regional Jet reported the camouflage-painted drone was at an altitude of about 2,300 feet, five miles north-east of the airport. The FAA hasn’t been able to find the drone or identify its operator.

Some other recent incidents:

The pilots of a regional airliner flying at about 10,000 feet reported seeing at least one drone pass less than 500 feet above the plane moving slowly to the south toward Allegheny County airport near Pittsburgh. The drone was described as black and gray with a thin body, about five to six feet long.



Air traffic controllers in Burbank, California, received a report from a helicopter pilot of a camera-equipped drone flying near the giant Hollywood sign.



Controllers at central Florida’s approach control facility received a report from the pilots of an Airbus A319 airliner that they had sighted a drone below the plane at about 11,000 feet and 15 miles west of Orlando. The drone was described as having a red vertical stabilizer and blue body. It wasn’t picked up on radar.



The pilots of a regional airliner reported spotting a drone 500 feet to 1,000 feet off the plane’s right side during a landing approach to runway 4 of the Greenville-Spartanburg international airport in South Carolina. The drone was described as the size of a large bird.



A five-foot-long drone with an attached camera crashed near Dallas Love Field in Texas. The wreckage was discovered by a worker at a factory near the airport. Police said they were looking for the operator.



In some cases the FAA has “identified unsafe and unauthorized [drone] operations and contacted the individual operators to educate them about how they can operate safely under current regulations and laws,” the agency said in a statement late Tuesday. The FAA also said rogue operators have been threatened with fines.

Aviation safety expert John Goglia, a former National Transportation Safety Board member, said he’s skeptical of some of the reports because most of the small drones currently being sold can’t reach the altitudes cited by pilots. Still, “it needs to be run to ground. That means a real investigation, real work done to determine just what these reports mean,” he said.

More than 1 million small drones have been sold worldwide in the past few years, said Toscano, the official with the drone industry group. It is inevitable that some will misuse them because they don’t understand the safety risks or simply don’t care, he said.

“This technology has a phenomenal upside that people are still just trying to understand,” he said. “As unfortunate as it would be that we have an incident, it’s not going to shut down the industry.”

Brendan Schulman, a New York attorney who represents drone operators challenging FAA restrictions, said some of the incidents come from police and other helicopter pilots who see a drone in the distance and then fly over to it to get a good look rather than remaining safely away from it.

The FAA is expected to propose regulations before the end of the year that would allow broader commercial use of drones weighing less than 55lb. The FAA prohibits nearly all commercial use of drones, although that ban is being challenged. So far, the only commercial permits the agency has granted have been to two oil companies operating in Alaska and seven aerial photography companies associated with movie and television production.

But the ban has been ignored by many other drone operators, from real estate agents to urban planners to farmers who use them to monitor crops.