Definition
A published or assigned flight path that guides an aircraft from takeoff at a specific airport into the en route airway structure, used to provide an orderly, obstacle-aware transition from the airport environment to cruise navigation.
Plain English
The path a pilot is told to fly after takeoff to get from the airport out to the main travel routes used for the rest of the flight.
Context Anchor
You may see or use this term when planning an instrument flight, getting a briefing from Flight Service, filing a flight plan, or receiving an air traffic control clearance.
Derivation
Departure comes from the Latin 'departire,' meaning 'to divide' or 'go away from.' In aviation, it points to the act of leaving the airport. Pairing it with 'route' makes it specifically the path used while doing so.
Why Pilots Care
Following the correct departure route keeps the aircraft separated from terrain and other traffic while meeting regulatory and airspace requirements.
Intuition Check
Do not think of a departure route as just a general direction after takeoff. In aviation, it means a specific path you plan, file, are assigned, or are expected to fly when leaving the airport area.
Example Sentence 1
After takeoff, the pilot followed the assigned departure route until reaching the first en route fix.
Example Sentence 2
After takeoff the aircraft followed the assigned departure route through the initial climb segment.