Airspace Classes Clearance Flight Plan 
Pilot Institute
SEPTEMBER 18, 2024
Many factors could prevent the controller from providing this service, such as: Radar Limitations Traffic Volume Controller Workload Frequency Congestion The workload-permitting service makes flight following different from Instrument Flight Rule (IFR) flights. You can learn more about airspace requirements here.
Flight Training Central
MARCH 18, 2024
For example, a pilot flying IFR in controlled airspace will have to file an IFR flight plan and receive an ATC clearance. For VFR flight, controlled airspace means increased cloud clearance and visibility requirements. ADS-B Out is also a requirement in Class A.
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