Definition
Direct routes flown by area navigation (RNAV)-equipped aircraft that are not based on published airways or fixes. The route is defined by waypoints the pilot enters into the navigation system, typically by latitude/longitude or by named fixes, and is approved by ATC on a case-by-case basis at or above the minimum en route altitudes for the area.
Plain English
A custom direct route between waypoints of your choosing, rather than following the published airway network. Your navigation equipment flies you point-to-point, and ATC clears you on it instead of routing you along the usual highways in the sky.
Context Anchor
Seen in instrument flight planning, clearances, and route descriptions when an aircraft is approved to navigate directly between defined points using onboard navigation equipment.
Derivation
Random' here doesn't mean unpredictable or arbitrary — it means 'not following a fixed published structure.' The route is chosen freely by the pilot rather than picked from the airway chart.
Why Pilots Care
They enable shorter, more efficient routing that saves time and fuel compared with following published airways.
Intuition Check
Random does not mean the route is guessed, unsafe, or chosen casually. Here, it means the route is specifically defined, but it is not one of the normal fixed airway paths.
Example Sentence 1
Because the aircraft was RNAV-equipped, the pilot filed a random RNAV route directly from departure to destination instead of following the published airways.
Example Sentence 2
ATC issued a clearance for random RNAV routes to bypass a busy airway segment.