The North American Aerospace Defense Command (NORAD) and Federal Aviation Administration (FAA) will be conducting flights in the Washington area over the next two weeks.
The flights involving small radio controlled models and light sport aircraft start Monday and will continue through next Friday. They are meant to help calibrate systems and equipment and refine NORAD's ability to respond to unknown and potentially threatening aircraft.
Most of the flights will take place between 8 a.m. and 5 p.m., but there will be flights between midnight and 6 a.m. on May 10 and 11.
The radio controlled models will fly in restricted airspace near Quantico and along the Potomac River.
Falcon Jet, Twin Otter, Cessna and BD-5 aircraft will fly a variety of patterns between 500 feet and 18,000 feet above ground level.