There are Class E airspace areas that extend upward from a specified altitude to, but not including, 18,000 feet MSL and are designated as offshore airspace areas.
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The FAA requires ADS-B Out capability in the continental United States, in the ADS-B rule airspace designated by FAR 91.225: Class A, B, and C airspace; Class E airspace at or above 10,000 feet msl, excluding airspace at and below 2,500 feet agl; Within 30 nautical miles of a Class B primary airport (the Mode C veil);
Class E airspace has no requirements for communication when flying VFR. You only have to maintain two-way communication in Class E airspace when flying IFR.
While Class E airspace is considered “controlled airspace”, you do not need an ATC clearance to fly in it. Since Class “E” airspace is basically “Everywhere”, most of the focus is placed on identifying the ceiling and floor of the airspace.
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.
SVFR operations may be authorized for aircraft operating in or transiting a Class B, Class C, Class D, or Class E surface area when the primary airport is reporting VFR but the pilot advises that basic VFR cannot be maintained.
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.
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.
Class E. Class E airspace is for IFR and VFR use. IFR aircraft require ATC clearance and compliance with ATC instructions is mandatory for separation purposes. VFR traffic does not require clearance to enter class E airspace.
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.
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.
If the airport of departure and arrival, and the route flown, are all in uncontrolled airspace, no ATC contact is needed. Your location will determine whether or not you need to contact Air Traffic Control. If you are within an airport traffic area that has a control tower, you'll need to contact atc.
Upper Class E airspace operations refer to those that take place over 60,000 feet above mean sea level (MSL) in the National Airspace System (NAS). Operations in upper Class E airspace have historically been limited due to the challenges faced by conventional fixed wing aircraft in reduced atmospheric density.
You can only conduct special VFR operations in controlled airspace below 10,000 MSL at an airport that has airspace extending down to the surface. Many Class C and B airports (listed in FAR 91) don't accommodate Special VFR clearances for IFR traffic separation reasons.