Unless otherwise specified, Federal Airways include Class E airspace upward from?

Federal Airways are established to provide a defined route structure for aircraft navigating through the airspace system. In the United States, unless there are specific exceptions or specifications, Federal Airways are classified under Class E airspace that begins at 1,200 feet AGL (Above Ground Level) and extends up to but does not include 17,999 feet MSL (Mean Sea Level).

This structure is important for pilots to understand, as it helps guide flight planning and ensures safe separation between different types of air traffic. The specification of starting at 1,200 feet AGL means that below this altitude, airspace management and communication may differ, commonly being Class G airspace which is uncontrolled and allows aircraft operations without the need for communication with air traffic control.

The choice of 1,200 feet as the lower boundary for Class E airspace is particularly significant for visual flight rules (VFR) pilots, as it marks the transition from uncontrolled to controlled airspace, where certain rules and regulations come into effect that support safe navigation and coordination in busier air traffic areas. It’s essential for pilots to have clarity on these altitudes as they prepare for flight operations and navigate through different airspace classifications.