Definition
A published RNAV (area navigation) airway available for use by properly equipped aircraft operating in the high-altitude structure between 18,000 feet MSL and FL 450 inclusive. Q-routes are based on GPS or other RNAV systems rather than ground-based navigation aids, and are depicted on en route high-altitude charts.
Plain English
A high-altitude airway designed for aircraft that navigate using GPS or similar onboard equipment instead of following signals from ground stations.
Context Anchor
Seen on high-altitude IFR en route charts, in IFR flight plans, and in ATC clearances for aircraft flying above 18,000 feet.
Derivation
The letter 'Q' is simply the route identifier the FAA assigned to this category of RNAV airway, similar to how 'V' identifies Victor airways and 'J' identifies Jet routes. The letter itself has no meaning beyond being the chart label.
Why Pilots Care
Provides efficient, direct routing options that reduce flight time and fuel use when the aircraft is properly equipped.
Intuition Check
Do not read Q-route as just any route with the letter Q in it. In this context, it means a specific published high-altitude RNAV route shown on IFR charts.
Example Sentence 1
We filed Q-146 from Denver to Kansas City because the aircraft is GPS-equipped and the route was more direct than the nearby Jet airway.
Example Sentence 2
ATC issued a clearance to join the Q-route after departure to avoid busy conventional airways.