Airspace Classes Ceiling Clearance 
Pilot Institute
APRIL 24, 2024
Class B airspace features multiple tiers with shelves progressively spreading outwards up to 30 nm. Pilots must meet equipment and certification requirements and have ATC clearance to enter. VFR flyways, corridors, and transition routes help VFR traffic transit the crowded airspace. What is Class B Airspace?
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. For the VFR pilot flying in B, C, and D airspace, there are communication and/or clearance requirements.
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