...Maximum that you can kill directly in one place in one day is 1500. The most effective places for attack are initially the mains strike area, the supply routes, and other frontline towns, the close to the front, the more important are your victories.

Second component is recon. Reconnaissance flight can increase enemy losses by a percent of the recon. Every recon plane landing brings 10% of the recon (5 if it did not land by mission end). Using recon you can double enemy losses in the same town, up to 3000. Если довести до 100%.

Third component is a direct destruction of the roads. It is achieved by attacking transport units at supply routes and the point of main strike. Current destruction level is shown on the map. At the end of the day the roads will recover by 20%.

Fourth, and likely the most important component is achieving air superiority over supply routes and the point of main strike. To do it you must shot down there more enemy planes than to lose your own. Considering, that these areas are ones that are a subject of the most intensive ground attack campaigns, it is hard to overestimate a role of escort and intercept groups.