I would like to add a note
OEJN is Jeddah Airport
OEJD is Jeddah Center
HECA is Cairo Intl
HECC is Cairo Center
I have heared that The E in oEjd and the E in hEcc
is dueto Egypt was responsible for all ATC Operations with in Saudi Airspace and the ICAO haven't changed the letter
is that correct ?????