At many airports both arrivals and departures are handled by a single approach control unit, on one frequency. At busier airports, departures and arrivals may be handled separately, that is on separate frequencies.
In addition to the ATC route clearance, departing IFR flights may be given departure instructions for separation. These may be given in plain language or in the form of a standard instrument departure (SID).
GREENVILLE DEPARTURE FASTFLY 123 HEAVY
FASTFLY 123 TURN RIGHT HEADING 050 UNTIL PASSING FL 080 THEN DIRECT TENTOWN VOR
RIGHT HEADING 050 UNTIL PASSING FL 080 THEN DIRECT TENTOWN VOR FASTFLY 123
FASTFLY 123 REPORT PASSING FL 080
FASTFLY 123 WILCO
FASTFLY 123 PASSING FL 080 TENTOWN VOR AT 1614
FASTFLY 123 CONTACT GREENVILLE CONTROL ON 128.425
128.425 FASTFLY 123