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The blue color code is specifically associated with personnel who handle aircraft movements around the airfield and manage the loading and unloading process. This includes plane handlers, aircraft elevator operators, and tractor drivers, who play crucial roles in ensuring the safe and efficient operation of aircraft on the ground. They are responsible for moving the aircraft from gates to runways, as well as assisting with ground support operations.

In contrast, the other options pertain to different roles that do not fall under the blue color code. Air traffic controllers, for example, are tasked with ensuring the safe and orderly flow of air traffic in the skies and at airports, but their activities are governed by a different color coding. Messengers and phone talkers serve communication roles, facilitating information exchange but not directly involved in ground movement tasks. Airfield maintenance crews are essential for the upkeep of airfield infrastructure, but they are not associated with the blue code either. The distinction in color coding helps to quickly identify the specific functions and responsibilities of various personnel within the aviation environment.