S - Servicing 
S - Sierra 
S - South 
S - Stern 
S of AN - School of Air Navigation 
S of TT - School of Technical Training 
S&TT - Station & Target Towing 
S.O.S - School of Signals 
S/A - Selective Availability 
S/C - Sergeant Chef 
S/C - Step Climb 
S/D - Step Descent 
S/F - Slats/Flaps 
S/L - Squadron Leader 
S/Ldr - Squadron Leader 
S/N - serial number 
S/O - Second Officer 
S/R - Service Request 
S/S - Staff Sergeant 
S/V - Shop Visit 
S2 - Air Sahara 
SA - Sand 
SA - South African Airways 
SAA - Small Arms Association 
SAAF - South African Air Force 
SAALC - San Antonio Air Logistics Cent… 
SAC - Senior Aircraftman 
SACEUR - Supreme Allied Commander Euro… 
SACL - Sydney Airports Corporation Lim… 
SACS - Software Avionics Command Suppo…