Definition
A low-altitude RNAV (area navigation) airway established by the FAA for use by aircraft equipped with GPS or other suitable RNAV systems. T-routes exist in the controlled airspace below 18,000 feet MSL and are designated with a 'T' prefix followed by a number (for example, T-295). They provide a direct, GPS-based alternative to the conventional VOR-based Victor airway system.
Plain English
A low-altitude flight path drawn between GPS waypoints that pilots with GPS-equipped aircraft can use instead of the older airways that follow ground-based radio stations.
Context Anchor
Seen on IFR low-altitude en route charts and in flight plans, where it appears as a route name such as T295.
Derivation
The 'T' simply identifies the route type as an RNAV (GPS-based) low-altitude airway, distinguishing it from 'V' (Victor) airways that follow VOR signals. The lettering is a chart convention, not an abbreviation of a longer word.
Why Pilots Care
Gives instrument pilots shorter, more fuel-efficient routes through airspace where traditional airways would require extra distance or doglegs.
Intuition Check
Do not read T-route as a training route, temporary route, or terminal route. In this context, T identifies a published low-altitude instrument route based on area navigation.
Example Sentence 1
She filed her IFR flight plan along T-295 to take advantage of the more direct GPS routing through the mountains.
Example Sentence 2
ATC cleared the aircraft to join T-route T-300 after departure for a shorter path through the sector.