What are Federal airways?

• A. Uncontrolled airspace
• B. Class B airspace
• C. Class C airspace
• D. Class E airspace extending upward from 1,200 ft to but not including 18,000 ft MSL

Answer: (D)

Federal airways are the network of IFR routes in the United States that connect VORs, guiding aircraft along defined corridors through controlled airspace. They exist within Class E airspace and extend from 1,200 feet above the surface up to, but not including, 18,000 feet MSL. This arrangement provides predictable separation for IFR traffic and a clear structure for navigation between navigation aids. The usual width is eight nautical miles total, centered on the airway’s centerline. VFR pilots may operate in these airways, but they must comply with the applicable weather minimums since the airspace is controlled. In contrast, uncontrolled airspace and airspaces around some airports (Class B or Class C) have different rules and purposes, so they do not define federal airways.