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