On Course

  1. Used to indicate that an aircraft is established on the route centerline.
  2. Used by ATC to advise a pilot making a radar approach that his/her aircraft is lined up on the final approach course.

Source: FAA Pilot/Controller Glossary (definition from the 2023 edition; current: Change 1 of 7 August 2025).

See also

Related terms

Glossary last updated 2026-10-28.

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