What is a common feature of ground support equipment?

The correct answer highlights that ground support equipment is specifically designed to support aircraft operations. This encompasses a wide range of functionalities, including fueling, baggage handling, maintenance, and aircraft positioning. The primary purpose of this equipment is to ensure that aircraft can operate efficiently and safely during turnarounds, thus playing a crucial role in overall airport operations.

While other options mention aspects like operator training or weather conditions, they lack the core focus on the essential role this equipment plays in facilitating the effective and safe movement of aircraft on the ground. Supporting aircraft operations is the fundamental principle behind the existence and use of ground support equipment within the aviation industry.