(4)
The letters Q, T, Y and Z identify RNAV routes which do not form part of the regional networks of Air Traffic Service routes.

b. SUPPLEMENTARY DESIGNATOR PREFIXES

(1)
K (KOPTER) is used to identify a low level route established for use primarily by helicopters.

(2)
U (UPPER) is used to indicate that the route (or portion thereof) is established in upper airspace.

(3)
S (SUPERSONIC) is used to indicate a route which is established exclusively for use by supersonic aircraft during acceleration, deceleration and while in supersonic flight.

c. DESIGNATOR SUFFIXES

(1)
The letter F to indicate that on the route or portion thereof advisory service only is provided.

(2)
The letter G to indicate that on the route or portion thereof flight information service only is provided.

(3)
For RNP 1 routes at and above FL200, the letter Y to indicate that all turns on the route between 30 and 90 degrees shall be made within the allowable RNP tolerance of a tangential arc between the straight leg segments defined with a radius of 22.5 NM (e.g. A123Y[1]).

(4)
For RNP 1 routes at and below FL190, the letter Z to indicate that all turns on the route between 30 and 90 degrees

shall be made within the allowable RNP tolerance of a tangential arc between the straight leg segments defined with a radius of 15 NM (e.g. G246Z[1]).
d. DESIGNATOR APPLICATIONS
ICAO recommends that Air Traffic Service route designators described above should consist of a basic alphanumeric designator, i.e., A411, which may be supplemented by one prefix as required, i.e., UA411, and/or as required by a single suffix, i.e., A411F.
e. DESIGNATOR PRONUNCIATIONS
With the exception of the descriptors "KOPTER", "UPPER" and "SUPERSONIC", the ICAO spelling (phonetic) alphabet will be used in voice communications when referring to the following Air Traffic Service route designators or suffixes:
A = ALFA N =  NOVEMBER B =  BRAVO P = PAPA D = DELTA Q = QUEBEC F =  FOXTROT R = ROMEO G = GOLF T = TANGO H =  HOTEL V = VICTOR J =  JULIETT W = WHISKEY L = LIMA Y = YANKEE M = MIKE Z = ZULU
NOTE: Some countries continue to identify Air Traffic Service routes using color designations instead of the phonetic alphabet; i.e., A - Amber, B - Blue, G - Green, etc.

7-17 VERTICAL SEPARATION -
a. CRUISING LEVEL
(1)
VFR - Whenever possible aircraft on transit flights above 3000 feet Above Ground Level are to be flown at appropriate Cruising Levels.

(2)
IFR - Outside Controlled Airspace under IFR aircraft are to be flown at appropriate Cruising Levels unless precluded by the nature of the operation.

(3) The cruising levels to be observed are as follows:.
TRACK. 
From 000° to 179°.  From 180° to 359°. 
IFR FLIGHTS  VFR FLIGHTS  IFR FLIGHTS  VFR FLIGHTS 
FL  ALTITUDE  FL  ALTITUDE  FL  ALTITUDE  FL  ALTITUDE 
Meters Feet  Meters Feet  Meters Feet  Meters Feet 

-90  - -- 0  - --
10  300 1000  - -- 20  600 2000  - --
30  900 3000  35  1050 3500  40  1200 4000  45  1350 4500
 50  1500 5000  55  1700 5500  60  1850 6000  65  2000 6500
 70  2150 7000  75  2300 7500  80  2450 8000  85  2600 8500
 90  2750 9000  95  2900 9500  100  3050 10000  105  3200 10500
 110  3350 11000  115  3500 11500  120  3650 12000  125  3800 12500 
130  3950 13000  135  4100 13500  140  4250 14000  145  4400 14500 
150  4550 15000  155  4700 15500  160  4900 16000  165  5050 16500 
　
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