|Controlled Airspace||Uncontrolled Airspace||Classifications||RVSM|
EPWW Airspace is divided into two Flight Information Regions (FIR's). At and above FL245, this is known as the Upper Flight Information Region and below FL245, it is known as the Lower Flight Information region.
The classification of airspace determines which flight rules apply and the minimum services that are to be provided in that airspace. There are 3 types of airspace in the EPWW; A to G, A being the most restrictive and G being the least restrictive.
Class C airspace in the [ICAO] can be found between FL195 and FL245 throughtout the [ICAO].
Class D airspace in the [ICAO] can be found in most control zones around airports.
Class G airspace is Uncontrolled Airspace - More than half of the [ICAO] airspace is class G, and can be found all around the country.