k.
ICAO CLASS F AIRSPACE - ATC provides separation service to IFR aircraft so far as practical - has no equivalent in U.S. airspace.

NOTE:  Within the airspace classes, there is a hierarchy and, in the event of an overlap of airspace: Class A pre-empts Class B, Class B pre-empts Class C, Class C pre-empts Class D, Class D pre-empts Class E, and Class E pre-empts Class G. When overlapping airspace designations apply to the same airspace, the operating rules associated with the more restrictive airspace designation apply.
(SPEC/14 CFR 71.9)
4. FAA AIRSPACES - Airspaces of defined dimensions, alphabetically designated, within which specific types of flight may operate and for which air traffic services and rules of operation are specified. States shall select those airspace classes appropriate to their needs.
a. FAA airspaces shall be classified and designated in accordance with the following:
CLASS A - IFR flights only are permitted, all flights are subject to air traffic control service and are separated from each other.
CLASS B - IFR and VFR flights are permitted, all flights are subject to air traffic control service and are separated from each other.
CLASS C - IFR and VFR flights are permitted, all flights are subject to air traffic control service and IFR flights are separated from other IFR flights and from VFR flights. VFR flights are separated from IFR flights and receive traffic information in respect of other VFR flights.
CLASS D - IFR and VFR flights are permitted and all flights are subject to air traffic control service, IFR flights are separated from other IFR flights and receive traffic information in respect of VFR flights, VFR flights receive traffic information in respect of all other flights.
CLASS E - IFR and VFR flights are permitted, IFR flights are subject to air traffic control service and are separated from other IFR flights. All flights receive traffic information as far as is practical.
CLASS G - IFR and VFR flights are permitted and receive flight information service if requested.
b. The requirements for flight within each class of airspace shall be as shown in the following table.
NOTE:  Where the proposed FAA airspaces adjoin vertically, i.e. one above the other, flight at a common level would comply with requirements of, and be given services applicable to, the less restrictive class of airspace. In applying these criteria, Class B Airspace shall therefore be considered less restrictive than Class A Airspace; Class C Airspace less restrictive than Class B Airspace; etc.
a. All flights departing Alaska will file a DD Form 1801 (DoD International Flight Plan). The DD Form 1801 will be filed for one destination only, because there is no provision to include a stopover in International Flight Plans. The DD Form 175 and domestic procedures will be used for Intra-Alaska flight.
b. ANCHORAGE OCEANIC - See Alaska Supplement
Notices and Procedures. (AFFSA/AFFSA)
　
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