SA—Situational Awareness

SAMS—Special Use Airspace Management System

SAR—Search and Rescue

SAS—Stability Augmentation System

SDF—Simplified Directional Facility

SDR—Service Difficulty Reports

SER—Start End of Runway

SIAP—Standard Instrument Approach Procedure

SID—Standard Instrument Departure

SIGMET—Significant Meteorological Information

SM—Statute Mile

SMA—Surface Movement Advisor

SMGCS—Surface Movement Guidance and Control System

SOIA—Simultaneous Offset Instrument Approaches

SOP—Standard Operating Procedure

SPECI—Non-routine (Special) Aviation Weather Report

SSV—Standard Service Volume

STAR—Standard Terminal Arrival

STARS—Standard Terminal Automation Replacement System