Flight Plan is a document which includes detailed information of flight from one point to another. It comprises of fuel planning, departure information, aircraft callsign and many more. Sure FSX aviators would know about this while filing your flight plan into the Vatsim server. But that is on virtual simulation. Ever wondered how pilots do that in the real world scenario? Lets begin.
For commercial flights, usually flight dispatchers will do it via email or fax but most common is email. Flight dispatchers or known as flight operations officer is a person who performs operational duties related to preflight (preparation) such as establishing performance of limited weight, interpretation of weather and NOTAM, flight planning, and crew briefing. They will send what's called a repetitive flight plan meaning for certain period of time or season the flight plan for a schedule flight will be sent once only. The only thing that changes in these flight plans is the aircraft registration or other information that may vary from flight to flight.
But, generally flight planned route, timing and all that is set won't change. For private pilots, they will either file the flight plan through the ground handler appointed by the company or they will fill in the flight plan form and submit to the ATC unit. For large airports which has AIS (aeronautical information service) such as KLIA, Kuching, KK etc, the flight plan will be submitted to AIS office where the AIS officer will enter the flight plan into the system until such a time comes where the electronic flight strip will be activated by the system. If there is no AIS office, they will file using a paper flight plan form and submit to the tower.
Credits to Prestley Shim (CAAM Assistant ATCO Trainee)