NO and NO2 emission ratios measured from in-use commercial aircraft during taxi and takeoff - Brown, Robert C.; Demerjian, Ken.; Herndon, Scott C.; Jayne, John.; Kolb, Charles E.; Lanni, Thomas.; Miake-Lye, Richard C.; Nelson, David D., Jr.; Shorter, Joanne H.; Silva, Phillip.; Waitz, Ian.; Zahniser, Mark S.