Originally Posted by
Sabasi
The airways B747-437B listed are suggestive, not mandatory. Deviations do occur. Aside from that, there are plenty of aviation waypoints off the coast of Yemen to construct a commercial aviation routing, including IMKAD, NODMA, RIGAM, ORBAT, XANLO, PAXED, SOKEM, AMBOD, SEPRO, and MIXAN.
Three comments (at the risk of taking this thread completely off topic).
a) It is mandatory for UAE operators to use B400/UB403/B404/R401 exclusively when in OYSC FIR. No deviation is permitted. Above restrictions in place since 31MAY15. Operators from other states may have different restrictions, but for the most part these airways are the only ones in use except for traffic actually originating/terminating in OYSC FIR (which has its own set of issues with permits).
b) IMKAD-NODMA-RIGAM-ORBAT-XANLO-PAXED-SOKEM-AMBOD-SEPRO-MIXAN can be paraphrased as IMKAD B400 RIGAM P751 MIXAN. The use of P751 is restricted presently by pretty much every major aviation insurer, if not by the various aviation authorities and most importantly the coalition forces that control the airspace.
c) The standard routing used nowadays by ET for Middle East routes through OYSC FIR is IMKAD B400 RIGAM B404 DEMGO and then PAKER ZIZAN OKTOB and onwards into HAAA FIR. That skirts Sanaa and Mogadishu FIR boundary.