Definition
An ATC service that allows IFR aircraft to fly a route between two airports staying entirely within the airspace of approach control facilities, without being handed off to an Air Route Traffic Control Center (ARTCC). It is generally used for short, low-altitude IFR flights in regions where adjacent approach controls have established connecting routes.
Plain English
A way to fly an IFR trip between two nearby airports while staying with approach controllers the whole way, instead of being passed off to the higher-level center controllers.
Context Anchor
Pilots usually encounter this term when planning or flying short IFR trips in busy areas where published tower en route routes are available.
Derivation
Called 'tower en route' because the en route portion of the flight is handled by terminal (tower/approach) facilities rather than by an en route center. The name describes which type of facility is in charge during the cruise segment.
Why Pilots Care
It reduces workload and delays for short instrument flights by keeping control local instead of routing through full en route facilities.
Intuition Check
Do not read “tower” as meaning the airport tower cab controls the entire trip by itself. Here, “tower” refers to terminal-area ATC facilities that may include towers and approach controls working together over a short en route segment.
Example Sentence 1
For the short hop from Long Beach to San Diego, the pilot filed IFR and requested tower en route control to stay below the higher-altitude center traffic.
Example Sentence 2
With Tower En Route Control Service in use, the tower issued a direct clearance without involving the en route center.