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