Pacific Air Route Map

This was made by plotting several hundred aircraft position reports with PC-HFDL and Posfix, then layering the resulting maps with Photoshop. The result was a clear indication of the routes taken by airplanes between the US mainland and Hawaii. These were traced over on a new layer. Then the Posfix plots were dropped out, and the original map was combined with the new darkened lines, and saved as a new Posfix map. Subsequent plots have all been right on.