This is a hobby or you can call it a special type of a sport where people track aircrafts to ensure that they gather necessary information about the plane size, the engine type and function and things like the noise that is being produced when the plane is taking off. It is not only that one but it also ensures that data of airports and pilots are captured to ensure that the plane flies and lands safely to the required destination. The spotting is then finished with pictures and images to ensure that people get to understand what is actually happening to the aircrafts at all times. Camouflage marking is what is widely used but sometimes they use budges and logs to ensure that they do their marking at all times. This is the best way to ensure that they capture the data of the planes at all times.
You should only spot a given airline which means you will be working to spot as many planes as possible in the air line. Air traffic control system is what is being used to ensure that there is perfect marking of the planes. The hobbyist should consider traveling long distances to capture and spot the planes. Tracking of the planes has been used in the air control system, the military war detection and surveillance team. During the World War II this is the technique that was used to track the planes because there were no technological advanced systems to monitor planes.