ATIS
Automatic Terminal Information Service
Air Traffic Indicator System
Aircraft Traffic Inspection System
Aviation Training and Information System
VFR
Visual Field Reference
Vector Following Radar
Visual Flight Rules
Vertical Flight Regulation
IFR
Initial Flight Routing
In-Flight Regulations
Instrument Flight Rules
International Flight Reference
ICAO
Independent Civil Air Operations
International Civil Aviation Organization
International Cargo Air Operations
Instrument Control and Operations
ILS
Independent Landing Signal
Integrated Landing Standard
International Light System
Instrument Landing System
SID
Station Identification Data
Standard Instrument Departure
Secondary Instrument Display
System Integration Design
STAR
Standardized Tracking and Approach Route
System Tracking and Radar
Standard Terminal Arrival Route
Secondary Traffic Area Regulation
METAR
Meteorology and Aviation Resource
Mission Event Traffic and Reports
Measurement of Aeronautical Runway
Meteorological Aerodrome Report
NOTAM
Notification of Air Traffic Management
Notice of Temporary Airspace Movement
Navigation Over Terrain and Maps
Notice to Airmen
TCAS
Terrain and Cloud Avoidance System
Traffic Collision Avoidance System
Tactical Communication and Alert System
Traffic Control Advisory Signal
APU
Auxiliary Power Unit
Aircraft Propulsion Unit
Automatic Pilot Utility
Air Pressure Utility
EGPWS
Enhanced Ground Proximity Warning System
Emergency Ground Power and Weather Station
Engine Ground Propulsion Warning System
Electronic Ground Procedure Warning Signal
RVSM
Real-Time Vertical Safety Measure
Required Vertical Space Monitoring
Radar Vertical System Management
Reduced Vertical Separation Minimum
ETOPS
Extended Twin Operations Procedure Standard
Engine Takeoff Optimization Procedure Standard
Emergency Takeoff and Operational Protocol System
Extended-range Twin-engine Operational Performance Standards
MNPS
Maximum Navigation Performance System
Minimum Navigation Performance Specification
Mandatory Navigation Procedures and Standards
Multi-Navigation Pilot Specification
PBN
Performance-Based Navigation
Precision-Based Network
Predictive Beacon Network
Pilot-Based Navigation
