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International High Altitude Enroute Airway Prefix

So I know what a J route is, I know what a Q route is, but in the Middle East they seem to have a large variation of RNAV route prefixes, such as UL, UP, etc.. Anyone know of a resource that defines these prefixes? Thanks,



Rest of world uses different

Rest of world uses different standardisations than US and Canada, so J, Q and other designated letters doesnt mean anything there. In Europe, U prefix mean that is an Upper Air Route, so for example L5 is airway and UL5 is Upper Air Route, they follow the same route, it just a vertical separation. At middle east there is no such consistency, so I guess its just a random letters.