Airways

• Based on a centerline that extends from one navigational aid NAVAID/waypoint/fix/intersection to another NAVAID/waypoint/fix/intersection
• Includes the airspace within parallel boundary lines 4 NM to each side of the centerline
• Floor of 1,200’ AGL, unless otherwise specified

• 1,200’ AGL - 17,999’ MSL
• Published on sectional and low en route charts
• ‘V123’ (N/S odd number, E/W even number)
• May coincide with other victor airways  ‘V123-246’

• Published on both en route low and high charts
• Depicted in aeronautical blue
• High altitude  ‘Q123’
• Low altitude  ‘T123’
• May be flown under IFR if approved by ATC
• Can only be approved in a radar environment
• Navigation is the responsibility of the pilot
• Direct routes between waypoints –

latitude/longitude coordinates, degree-distance fixes, or offsets from established routes/airways at a specified distance and direction

• 18,000’ MSL - FL450
• Published on high altitude en route charts
• ‘J12’

• Below 10,000’ MSL
• Operations in excess of 250 KN
• ‘IR’ IFR route, ‘VR’ visual route
• No segment above 1,500’ AGL  ‘IR-1234’
• Segments above 1,500’ AGL  ‘IR-123’
• All MTRs above 1,500’ AGL are charted

• Overlapping approach control radar services to provide IFR clearances
• Routed by airport control towers
• Abbreviated filing procedures and reduced traffic separation requirements