The T-39, DC-8 and ER-2 flew a coordinated mission over the CART site, under patchy cirrus clouds. The T-39 created contrails (by flying circles) upwind of the CART site. At the same altitude, but downwind of the CART site, the DC-8 flew perpendicular to the wind-direction to sample the remnants of the T-39 contrails, which were not too persistent to be easily identified, and to profile the patchy cirrus cloud-field. The ER-2, while flying an wind pattern, observed the other aircraft from above them.