En Route Transition

  1. Conventional STARs/SIDs. The portion of a SID/STAR that connects to one or more en route airway/jet route.
  2. RNAV STARs/SIDs. The portion of a STAR preceding the common route or point, or for a SID the portion following, that is coded for a specific en route fix, airway or jet route.

Source: Pilot Contoller Glossary (PCG)

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