NASA operates two Lockheed ER-2 Earth resources aircraft as flying laboratories in the Airborne Science Program under the Agency's Science Mission Directorate. The aircraft, based at NASA Armstrong's Building 703 in Palmdale, CA, collect information about Earth resources, celestial observations, atmospheric chemistry and dynamics, and oceanic processes. The aircraft also are used for electronic sensor research and development, satellite calibration, and satellite data validation.Info from NASA Pics thanks to DL Munne.