Control zone The U.S. uses “surface area” in place of the ICAO term “control zone.” Surface area is defined as the airspace contained by the lateral boundary of the Class B, C, D or E airspace designated for an airport that begins at the surface and extends upward.
Controlled airspace The U.S. uses the following definition of controlled airspace found in 14 CFR Section 1.1: “Controlled airspace means an airspace of defined dimensions within which air traffic control service is provided to IFR flights and to VFR flights in accordance with the airspace classification.”
Course, bearing, azimuth, heading, and wind direction U.S. uses “Course, bearing, azimuth, heading, and wind direction” information and it shall always be magnetic unless specifically stated otherwise.
Cruising level The U.S. uses the term “cruising altitude.”
Decision altitude Approach with vertical guidance (VNAV).
DETRESFA See ALERFA.
Expedite U.S. uses “EXPEDITE” by ATC when prompt compliance is required to avoid the development of an imminent situation. Expedite climb/descent normally indicates to a pilot that the approximate best rate of climb/descent should be used without requiring an exceptional change in aircraft handling characteristics.
Flight information centre In the U.S., the services provided by flight information centers (FICs) are conducted by air traffic control (ATC) facilities, automated flight service stations (AFSSs), and rescue coordination centers (RCCs).
Glide path The U.S. uses “glideslope” rather than “glide path” although the terms are sometimes interchangeable. For the U.S., a glideslope provides vertical guidance for aircraft during approach and landing.
Holding procedure In the U.S., a hold procedure is also used during ground operations to keep aircraft within a specified area or at a specified point while awaiting further clearance from air traffic control.
Holding point The U.S. uses “holding fix” rather than “holding point.”
INCERFA See ALERFA.
Kilometres U.S. ATS units do not accept aircraft speeds in metric terms nor do they use the term “minimum clean speed.” The U.S. does use phrases such as “maintain maximum forward speed” or ”maintain slowest practical speed.”
Level The U.S. uses ”altitude” or “flight level” rather than “level.”
May or need not U.S. uses “May” or “need not” means a procedure is optional.
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