In which type of airspace are VFR flights prohibited?

VFR flights are prohibited in Class A airspace, which is generally located from 18,000 feet MSL (Mean Sea Level) up to 60,000 feet MSL. This airspace is designed primarily for high-altitude, IFR (Instrument Flight Rules) traffic and is managed by air traffic control to ensure the safe and efficient flow of air traffic. The requirement for IFR operations in Class A airspace mandates that pilots must have an instrument rating and the aircraft must be equipped for IFR operations. This regulation aims to minimize potential conflicts and ensure safety in a heavily trafficked airspace environment where visual navigation is not practical or safe due to the altitude and the density of aircraft.

In contrast, Class B, C, and D airspaces allow for VFR operations under specific conditions, including traffic management strategies to facilitate both VFR and IFR traffic. Thus, they are regulated but do not outright prohibit VFR flights like Class A does.