What is a requirement for flying in Class A airspace?

In Class A airspace, which extends from 18,000 feet MSL up to and including FL600, it is mandatory for all aircraft to operate under Instrument Flight Rules (IFR). This requirement is in place regardless of the weather conditions. The objective is to maintain a high level of safety and efficiency in busy airspace, ensuring that aircraft are properly separated and guided by air traffic control throughout their flight.

Filing an IFR flight plan in Class A airspace is crucial because it allows air traffic controllers to manage and monitor air traffic effectively, providing necessary services such as navigation and separation from other aircraft. All pilots flying in this airspace, whether flying on a scheduled flight or a private flight, must comply with the IFR regulations, which include adhering to specific altitudes, routing, and communication requirements.

This structured approach is essential for safe operations given the high density of air traffic at these altitudes, making it imperative that pilots are prepared and trained for IFR conditions.