The FBI assured Congress that its plane surveillance program is not intended to perform mass surveillance or bulk intelligence collection, the Associated Press reports.
The FBI, however, declined to answer some questions about its planes, including how often they are used and how much they cost.
The briefing comes two weeks after the Associated Press revealed that the AP used fake company names to acquire at least 50 planes.
Most of the planes, the FBI said, don’t have high-definition cameras and rely on binoculars.
The planes were used only five times to track cellphones from the sky, according to the FBI.