This file contain data on the flight performance of flies in a standard assay. The variables are described as follows: 1) selection "treatment" (C, H, or T); 2) experimental "population" within the selection treatment (1-5); 3) isofemale line within the population (#.#); 4) temperature at which flies were reared (16 or 25C); 5) temperature at which flies were tested (16 or 25C); and whether flies successfully demonstrated flight (0 or 1)