Pilots will operate the aircraft at altitudes lower than typical commercial flights, executing specialized maneuvers such as vertical spirals between 1,000 and 10,000 feet, circling above power plants, landfills, and urban areas
www.nbcphiladelphia.com

NASA expected to conduct low-altitude flights in Philly this week
Two research planes flown out of a NASA research center in Wallops Island, Virginia, will be making a low-altitude trip over Philadelphia this week. The planes will also be visible in surrounding areas, such as Baltimore and Virginia.
