What is the difference between D and E airspace?

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.



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Airline Class of Service Codes A - First Class Discounted. B - Economy/Coach – Usually an upgradable fare to Business. C - Business Class. D - Business Class Discounted.

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Most airspace in the United States is class E. The airspace above FL600 is also class E. No ATC clearance or radio communication is required for VFR flight in class E airspace. VFR visibility and cloud clearance requirements are the same as for class C and D airspaces when below 10,000 feet (3,000 m) MSL.

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In class E airspace, IFR aircraft are controlled by ATC. This might be a center facility (Air Route Traffic Control Center) or approach/departure facility. As a VFR aircraft, you aren't required to be in contact with ATC, but IFR aircraft must operate on an ATC clearance. That means the airspace is controlled.

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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.

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It is the responsibility of the pilot to ensure that ATC clearance or radio communication requirements are met prior to entry into Class B, Class C, or Class D airspace. The pilot retains this responsibility when receiving ATC radar advisories. (See 14 CFR Part 91.)

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Class E airspace is often confusing though because it's not clearly depicted on the sectional chart, like the ATC-controlled Classes B, C or D. While Class E airspace is considered “controlled airspace”, you do not need an ATC clearance to fly in it.

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Class E airspace exists to provide added protection for the separation of IFR and VFR aircraft. It creates a type of airspace in which VFR pilots do not need special clearances, but IFR pilots do.

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Class E Airspace, indicated by the faded magenta line. Most of the airspace in The United States is Class E airspace. Class E airspace extends from 1,200 feet AGL to 17,999 feet MSL (18,000 feet is the floor of Class A airspace). Class E airspace can also extends down to the surface or 700 feet AGL.

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Class E Airspace: Controlled airspace which is neither class A, B, C nor D. In most areas of the United States, class E airspace extends from 1,200 feet (370 m) above ground level (AGL) up to but not including 18,000 feet (5,500 m) MSL, the lower limit of Class A airspace.

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Perhaps the most misunderstood airspace category, Class Echo (E) starts at 14,500'MSL and extends up to but not including 18,000' (bottom of Alpha Airspace) over the entire continental United States unless otherwise depicted. It also exists above Alpha (above 60,000').

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Class E airspace: Transponder requirements vary depending on the altitude of the aircraft: Below 10,000 feet MSL (mean sea level): A transponder is not required unless the aircraft is within 30 nautical miles of a Class B airport.

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D = EMPLOYMENT PURPOSES ONLY means the person can only drive to work and on-the-job. E = DAYLIGHT DRIVING ONLY means the person can only drive during daylight hours. F = AUTOMATIC TRANSMISSION means the person can only drive a vehicle that has automatic transmission.

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Class E4 and E3 airspaces do not require prior authorization, but Class E surface area (E2) airspace surrounds small airports and does require airspace authorization.

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250 knots below 10,000' MSL within class echo airspace. While operating in the traffic pattern at an airport without an operating control tower, it is recommended that the pilot maintain an airspeed of no more than 200 KIAS.

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Class E Airspace Requirements Basic VFR minimums are 3sm visibility, 500' below clouds, 1,000' above clouds, 2,000' horizontal from clouds.

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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.

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