Emergency Descents with ATC COMS - Video

Mike Ash schreef:

The flight of aircraft is "subject to restrictions" everywhere within
the US and most other countries. For example, can't PIC without a valid
pilot's certificate. Can't fly inside clouds while VFR. Do these
restrictions make the whole country a "restricted area"? Of course not!

"Restricted area" has a specific meaning in the US. It is specific
airspace which has special restrictions applied beyond those found in
normal airspace. On a sectional you will find restricted airspace to be
designated using a solid blue border with perpendicular blue dashes
pointing toward the inside. For an example, pull up NHK on skyvector.com.

Indeed I think there's confusion between the linguistical significance
of "restricted" and the more strict interpretation in aviation
regulations. For this once, though, I believe the term stems from ICAO
terminology and thus isn't limited to the USA.