Which personnel are responsible for directing aircraft on the ramp?

Ramp agents or ground control personnel are specifically trained and designated to direct aircraft on the ramp. These individuals are critical in ensuring that aircraft are safely guided to and from their parking positions, as well as directing them during their movements on the tarmac. They possess the necessary knowledge of airport operations, including traffic patterns and safety regulations, which is essential for preventing accidents and ensuring the efficient movement of aircraft.

In contrast, flight attendants are primarily focused on passenger safety and service within the aircraft, so they don't partake in ramp operations. Airport security personnel have a role related to the safety and security of the entire airport, but they are not directly involved in managing aircraft movements on the ramp. Ticketing agents deal with passenger check-in and baggage processes, but they too do not have responsibilities related to directing aircraft. Therefore, the role of ramp agents or ground control personnel is uniquely aligned with the task of directing aircraft, making them the correct choice for this question.