Identifying the ceiling of Class E airspace is easy, since it always ends at 17,999' MSL, with Class A airspace above (and then starts again at FL600/60,000' if you're out joyriding in an SR-71).
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E - Shuttle Service (no reservation allowed) or Economy/Coach Discounted. F - First Class. G - Conditional Reservation. H - Economy/Coach Discounted – Usually an upgradable fare to Business. J - Business Class Premium.
Class E-5 airspace areas may be established with MSL floors above 1,200 feet AGL. Normally floors will be at least 300 feet below the minimum IFR altitude.
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.
Class E airspace extensions begin at the surface and extend up to the overlying controlled airspace. The extensions provide controlled airspace to contain standard instrument approach procedures without imposing a communications requirement on pilots operating under VFR.
Class E airspace does not prohibit drone flight to anyone, but some circumstances require prior authorization. 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.
No person may operate an ultralight vehicle within Class A, Class B, Class C, or Class D airspace or within the lateral boundaries of the surface area of Class E airspace designated for an airport unless that person has prior authorization from the ATC facility having jurisdiction over that airspace.
On a map, Class G's ceiling is the floor of Class E airspace. And, it's always exclusive. For example, if Class E starts at 700 feet AGL, Class G goes up to, but doesn't include, 700 feet AGL. Class G airspace is most easily found on a sectional map when a fading, thick blue line appears.
In the 1900s, Hungarian physicist Theodore von Kármán determined the boundary to be around 50 miles up, or roughly 80 kilometers above sea level. Today, though, the Kármán line is set at what NOAA calls “an imaginary boundary” that's 62 miles up, or roughly a hundred kilometers above sea level.
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.
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.
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').
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.
(see figure 21) Even though class E airspace is controlled, it is not a requirement that VFR pilots to talk to controllers nor anyone else in this airspace. One important note about class E and G airspace is that radios are NOT required for VFR flight.
(a) Unless otherwise authorized by the Administrator, no person may operate an aircraft below 10,000 feet MSL at an indicated airspeed of more than 250 knots (288 m.p.h.).
The Federal Aviation Regulation (FAR) Part 91.119 indicates that, except when necessary for departure or landing, the minimum altitude over urban areas is 1,000 feet above ground level (AGL) and 500 feet AGL over rural areas.