Which of the following services do all ATS units provide?

All Air Traffic Services (ATS) units are responsible for ensuring the safe and efficient movement of aircraft in controlled airspace and during their flight. Among the variety of services provided by ATS units, information services and alerting services are fundamental to their operations.

Information services include providing pilots with essential information regarding weather, airspace conditions, and other pertinent details that could affect their flight. This is crucial for maintaining situational awareness and ensuring safe navigation.

Alerting services involve notifying appropriate search and rescue organizations when an aircraft is in distress or when its safety cannot be confirmed. This capability is vital for safeguarding lives and providing immediate assistance when required.

While control services and advisory services are also important, they are not universally provided by all ATS units. Some may focus exclusively on information and alerting functions, especially in less crowded or lower-level airspace. Hence, the provision of information and alerting services is a common element across all ATS units, which makes this answer accurate in reflecting their essential responsibilities.