It seems to me that the flight path that would create the most photo opportunities for the photographer would be one where the model is zig-zagged in and out as many times as possible as the model slowly makes its way from one end of the field to the other. So think of something like the flight path of a crop duster making runs that are perpendicular to the flight line. This is not something that most pilots practice, however.

Alternatively, flying tight figure 8s might work.