The FAA defines Class D airspace saying, “Generally Class D airspace extends upward from the surface to 2,500 feet above the airport elevation (charted in MSL) surrounding those airports that have an operational control tower.
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Controlled and uncontrolled airspaces are the ones you will spend most of your time flying within as a pilot. Controlled airspace consists of five tiers beginning with most restrictive to least restrictive: Class Alpha (A), Class Bravo (B), Class Charlie (C), Class Delta (D), and Class Echo (E).
Do you need a clearance to enter Class D airspace? Two-way radio communication is the only requirement to enter this type of airspace. A pilot does not need to hear a specific clearance from the control tower to enter as long as the tower responds to a request with their tail number.
Vertical boundaryThere is no international agreement on the vertical extent of sovereign airspace, with suggestions ranging from about 30 km (19 mi)—the extent of the highest aircraft and balloons—to about 160 km (100 mi)—approximately the lowest extent of short-term stable orbits.
The flight visibility and cloud clearance for VFR operations in Class D airspace is 3 statute miles visibility, and 500 feet below, 1,000 feet above, 2,000 feet horizontal from all clouds.
Restrictions in Class D airspaceMinimum visibility requirements of 3 statute miles. Cloud clearance minimums are 500 feet below, 1,000 feet above, and 2,000 feet horizontally. No VFR flights if ceiling is less than 1,000 feet AGL.
VFR cruising altitude rules in the US and CanadaIn the US, there are specific VFR cruising altitudes, based on the aircraft's course, to assist pilots in separating their aircraft while operating under visual flight above 3,000 ft above the surface (AGL) but below 18,000 ft Mean Sea Level (MSL).
I don't have ADS-B Out, where can I fly? Without ADS-B Out, you can fly in any airspace except the ADS-B rule airspace defined by FAR 91.225 (see above). Note that ADS-B is not required in Class D airspace, or under a Class B or Class C airspace shelf, unless it lies within a Mode C veil.
You can identify the Class D on a VFR sectional by a dashed blue line. The airspace will follow the extended lines of the instrument approaches to accommodate the arrival and departure paths of IFR traffic. The airspace normally extends from the surface up to a designated MSL altitude, normally 2500 ft.
Class D is used for controlled zones, or above and around airspace Class C designated zones where CVFR is not necessary. Class E is used for airspace between usually 2,500 ft (760 m) AGL (around airports 1,000 ft (300 m) or 1,700 ft (520 m) AGL) and FL 100.
At some airports that have part-time control towers, the Class D surface airspace becomes a Class E Surface Area during the hours the tower is closed. At other airports, the Class D airspace becomes Class G (uncontrolled) airspace.
(2) Class B airspace is more restrictive than Class C, Class D, Class E, or Class G airspace; (3) Class C airspace is more restrictive than Class D, Class E, or Class G airspace; (4) Class D airspace is more restrictive than Class E or Class G airspace; and. (5) Class E is more restrictive than Class G airspace.