Arrivals or departures of an aircraft in accordance with an IFR flight plan or special VFR procedures or an operation where IFR separation between aircraft is provided by a terminal control facility. There are three kinds of instrument operations:
1. Primary Instrument Operations: arrivals and departures at the primary airport which is normally the airport at which the approach control facility is located.
2. Secondary Instrument Operations: arrivals and departures at airports other than the primary airport.
3. Overflights: operations in which an aircraft transits the area without intent to land.
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