ER-2 tail number 709 was one of two Airborne Science ER-2s used as science platforms by Dryden.
EC98-44435-3
ER-2 tail number 709 was one of two Airborne Science ER-2s used as science platforms by Dryden. The aircraft are platforms for a variety of high-altitude science missions flown over various parts of the world. They are also used for earth science and atmospheric sensor research and development, satellite calibration, and data validation.March 2, 1998
NASA Photo / Tony Landis