The DC-8 and T-39 flew a coordinated mission over the CART site to profile cirrus clouds and for the T-39 to do near-field sampling of the DC-8 exhaust plume. Cirrus cells were observed the entire flight. While the DC-8 flew up and down wind tracks over the CART site, at different altitudes, the T-39 sampled its exhaust. Cirrus profiling was accomplished by the DC-8 by flying a racetrack pattern, in the up and down wind direction, while ascending, and then descending in slow spirals.