What is the rule for flight operations in Class A airspace?

In Class A airspace, the primary rule is that all operations must be conducted under instrument flight rules (IFR). This airspace extends from 18,000 feet up to and including 60,000 feet, where the air traffic control system manages all flights to ensure safety and efficiency. The requirement for IFR is crucial because pilots in this airspace must navigate primarily using instruments, especially considering the high altitudes and the potential for weather conditions that severely limit visibility.

This IFR requirement ensures that all aircraft are operated in a standardized manner, allowing for the safe separation and coordination of numerous flights in a busy and complex airspace system. Under these regulations, pilots must also maintain communication with air traffic control and adhere to specific flight plans, enhancing overall safety and efficiency in congested airspace. Therefore, understanding that Class A airspace mandates operations under IFR is essential for safe flight practices and compliance with aviation regulations.