WASHINGTON -- Heads up: Drones are going mainstream.
Civilian cousins of the unmanned military aircraft that have tracked and killed terrorists in the Middle East and Asia are in demand by police departments, border patrols, power companies, news organizations and others wanting a bird's-eye view that's too impractical or dangerous for conventional planes or helicopters to get.
But there are qualms.
Drones overhead could invade people's privacy. The government worries they could collide with passenger planes or come crashing down, concerns that have slowed more widespread adoption of the technology.
Despite that, pressure is building to give drones the same access as manned aircraft in the U.S.
"It's going to be the next big revolution in aviation. It's coming," said Dan Elwell, the Aerospace Industries Association's vice president for civil aviation.
Some impetus comes from the military, which will bring home drones from Afghanistan and wants room to test and use them. In December, Congress gave the Federal Aviation Administration six months to pick half a dozen sites around the country where the military and others can fly unmanned aircraft in the vicinity of regular air traffic, with the aim of demonstrating they're safe.
The Defense Department says the demand for drones and their expanding missions requires routine and unfettered access to domestic airspace, including around airports and cities. In an October report, the Pentagon called for flights first by small drones both solo and in groups, day and night, expanding over several years. Flights by large and medium-sized drones would follow in the latter half of this decade.
Other government agencies want to fly drones, but they've been hobbled by an FAA ban unless they first receive case-by-case permission. Fewer than 300 waivers were in use at the end of 2011, and they often include restrictions that severely limit the usefulness of the flights. Businesses that want to put drones to work are out of luck; waivers are only for government agencies.
But that's changing.
Congress has told the FAA that the agency must allow civilian and military drones to fly in civilian airspace by September 2015. This spring, the FAA is set to take a first step by proposing rules that would allow limited commercial use of small drones.
Until recently, agency officials were saying there were too many unresolved safety issues to give drones greater access. Even now FAA officials are cautious about describing their plans, and they avoid discussion of deadlines.
"The thing we care about is doing that in an orderly and safe way and finding the appropriate balance of all the users in the system," Michael Huerta, FAA's acting administrator, told a recent industry luncheon in Washington. "Let's develop these six sites -- and we will be doing that -- where we can develop further data, further testing and more history on how these things actually operate."