[charlie1017]

Some random ones...

RVR -Runway Visual Range
DA- Decision Altitude (Instrument approaches) or Density altitude (aircraft performance)
DH- Decision Height
MDA- Minimum Descent Altitude
TDZ- Touchdown zone
TOC- Top-of-Climb
TOD- Top of Descent
FOD- Foreign Object Damage
IMC- Instrument Meteorological Conditions
VMC- Visual Meteorological Conditions
FAF -Final Approach Fix
MAP- Missed Approach Point
VDP-Visual Descent Point
RVSM- Reduced Vertical Separation Minimums
ETOPS- Extended-Range Twin-Engine Operational Performance Standards
FSDO-Flight Standards District Office
ASRS-Aviation Safety Reporting System
AIM- Aeronautical Information Manual
PHAK-Pilot's Handbook of Aeronautical Knowledge
TFR- Temporary Flight Restriction
ADIZ- Air Defense Identification Zone
CA - Captain
NOTAM - Notice to Airmen
FAR- Federal Aviation Regulations
ILS -Instrument landing System
VOR- Very High Frequency Omnidirectional Range
NDB- Non-directional radio beacon
DME- Distance Measuring Equipment
TACAN- Tactical Air Navigation
VORTAC-VOR+TACAN
GPS-Global Positioning System
CONUS-Continental United States
WAAS-Wide Area Augmentation System
EFC- Expect Further Clearance
EDCT-Expect Departure Clearance Time
TT -Total Time
ETE- Estimated Time Enroute
ETA- Estimated Time of Arrival
GS- Ground Speed or Glideslope (Instrument approaches)
TAS-True Airspeed
CAS-Calibrated Airspeed
MEL-Minimum Equipment List
APU- Auxiliary Power Unit
WX- Weather
MX- Maintenance
OTS- Out of Service
FOI- Fundamentals of Instructing
PTS-Practical Test Standards
XJT- ExpressJet
ASA-Atlantic Southeast Airlines
SKW-Skywest airlines
MAG- Mesa Air Group
FBO- Fixed Base Operator
A&P- Airframe and Powerplant mechanic
A/P- Autopilot
RNP- Required Navigation Performance
HSI- Horizontal Situation Indicator
VASI- Visual Approach Slope Indicator
PAPI- Precision Approach Path Indicator
ATP- Airline Transport Pilot
ICAO- International Civil Aviation Organization
CASS- Cockpit Access Security System
TIPH- Taxi into Position and Hold
TCAS- Traffic Collision Avoidance System
RA- Resolution Advisory (TCAS)
METAR- Aviation Routine Weather Report
TAF- Terminal Aerodrome Forecast
FA (weather)- Area Forecast
PIREP- Pilot Report
FSS- Flight Service Station
ATIS- Automatic Terminal Information Service
OOTSK- Order of the Sleepless Knights
INDOC- Airline Indoctrination training
PIC- Pilot in Command
TPIC- Turbine Pilot in Command (flight time)
DT-Doug Taylor

Mods feel free to eliminate stuff if needed...