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| Flight Object Concept |
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An arrow going into the triangle signifies flight information made available.
An arrow coming out of the triangle signifies flight information no longer
available.
Definitions
- ATC
- Air Traffic Control
- DUAT
- Direct User Access Terminal
- FSS
- Flight Service Station
- OAG
- Official Airline Guide
- System
- National Airspace System (NAS) automation systems, including those
used in en route, terminal, and oceanic operations
- User
- Airspace user, including airlines, military, general aviation
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