Most aircraft travel point to point. Survey flights do not. They work an area the way a farmer works a field — methodically, repetitively, covering every square mile of a defined region before moving on.

The patterns are distinctive once you know what to look for: evenly spaced parallel passes, tight racetrack orbits, repeated grid coverage that retraces the same lattice across consecutive days.

Why it matters

Understanding the difference between survey patterns and ordinary traffic is the foundation of observation. Not every unusual flight is significant — but patterns that repeat are worth noting.