Aviation Glossary

255

255 terms across 12 categories

Airport Infrastructure 25 Airport Codes & Classification 18 Navigation & Airspace 22 Flight Operations 22 Passenger Experience 22 Airline Operations 20 Aircraft & Engineering 24 Aviation Weather 18 Safety & Regulations 22 Air Traffic Control 20 Travel Planning 22 Aviation Geography 20

Airport Infrastructure (25)

Airfield Lighting (AGL)

The system of lights on runways, taxiways, and aprons that guide aircraft during low visibility

Airport Fire Station (ARFF)

Airport Rescue and Firefighting facility providing emergency response for aircraft incidents

Apron

The area of an airport where aircraft are parked, loaded, fueled, and boarded

Baggage Handling System (BHS)

The network of conveyors and sorting equipment that moves luggage within an airport

Blast Fence

A barrier designed to redirect jet engine exhaust away from people and structures on the apron

Cargo Terminal

A specialized airport facility for handling freight and mail shipments

Concourse

A section of a terminal containing gates for aircraft boarding and deplaning

Control Tower (TWR)

The facility at an airport from which air traffic controllers direct aircraft movements

De-Icing Pad

A designated area where aircraft are treated with de-icing fluid before takeoff in cold weather

Displaced Threshold

A threshold not located at the beginning of the full-strength runway surface

Fixed-Base Operator (FBO)

A commercial business granted the right to operate at an airport providing aeronautical services

Fuel Farm

An airport facility that stores and distributes aviation fuel to aircraft

Gate

A designated area at an airport where passengers board and deplane aircraft

Hangar

An enclosed building structure to hold aircraft for maintenance or storage

Holding Bay

A designated area near the runway where aircraft wait before receiving takeoff clearance

ILS Localizer Antenna (LOC)

A ground-based radio transmitter providing horizontal guidance for precision approaches

Jet Bridge

An enclosed, movable connector between an airport terminal gate and an aircraft door

PAPI (PAPI)

Precision Approach Path Indicator — a visual aid providing glidepath guidance during approach

Runway (RWY)

A defined rectangular surface on an airport prepared for aircraft takeoff and landing

Runway End Safety Area (RESA)

An area beyond the runway end intended to reduce risk of damage to aircraft undershooting or overrunning

Runway Threshold

The beginning of the usable portion of a runway for landing

Stopway (SWY)

An area beyond the takeoff runway designated for decelerating an aircraft during an aborted takeoff

Taxiway (TWY)

A defined path on an airport for aircraft to travel between runways and aprons

Terminal

A building at an airport where passengers transfer between ground and air transportation

Windsock

A conical textile tube mounted on an airport that indicates wind direction and approximate speed

Airport Codes & Classification (18)

Airport Category

The classification system used to categorize airports by size, traffic, and facilities

Airport Elevation (ELEV)

The highest point of an airport's usable landing area measured above mean sea level

Airport Reference Point (ARP)

The designated geographical center of an airport used for identification and coordination

FAA Location Identifier (FAA LID)

A 3-4 character identifier used by the FAA for airports and navigation aids in the US

Focus City

An airport where an airline operates significant point-to-point service without full hub operations

General Aviation Airport (GA)

An airport primarily serving non-scheduled and private aircraft operations

Heliport

An area of land or a structure used for helicopter takeoff, landing, and parking

Hub Airport

An airport that serves as a transfer point for connecting flights, typically for one or more airlines

IATA Code (IATA)

A three-letter code assigned by IATA to identify airports worldwide

ICAO Code (ICAO)

A four-character alphanumeric code assigned by ICAO for airports and airfields

International Airport

An airport with customs and immigration facilities that handles international flights

Large Airport

An airport with substantial scheduled airline operations and high passenger volume

Medium Airport

An airport with moderate levels of commercial and general aviation activity

Reliever Airport

An airport designated to reduce congestion at a major commercial airport

Scheduled Service

Regularly operated commercial flights that run on published timetables

Seaplane Base

A facility on water for the takeoff, landing, and servicing of seaplanes and amphibious aircraft

Slot-Controlled Airport

An airport where takeoff and landing slots are allocated to airlines due to capacity constraints

Small Airport

An airport with limited aviation activity, often serving general aviation

Flight Operations (22)

Block Fuel

The total fuel required for a flight from engine start to engine shutdown

Block Time

The total time from gate departure to gate arrival, including taxiing and airborne time

Climb

The phase of flight where an aircraft gains altitude after takeoff

Crosswind Landing

A landing technique used when wind blows perpendicular to the runway direction

Cruise

The phase of flight at a relatively constant altitude and speed between climb and descent

Descent

The phase of flight where an aircraft reduces altitude as it approaches the destination

Diversion

A change in route to land at an airport other than the intended destination

ETOPS (ETOPS)

Extended-range Twin-engine Operations — rules governing how far twin-engine aircraft can fly from airports

Ferry Flight

A non-revenue flight for repositioning an aircraft to another airport

Flare

A pitch-up maneuver performed just before touchdown to reduce descent rate

Flight Plan (FPL)

A document filed with air traffic control detailing the intended route, altitude, and timing of a flight

Go-Around

An aborted landing where the aircraft applies full power and climbs away from the runway

Great Circle Route (GCR)

The shortest path between two points on the Earth's surface, commonly used in long-haul aviation

Holding Pattern

A racetrack-shaped flight path used to delay an aircraft's approach to an airport

Landing

The final phase of flight where an aircraft descends to the runway surface

Positioning Flight

A flight to move crew or aircraft to a location needed for operational purposes

Rhumb Line

A path crossing all meridians at the same angle, appearing straight on a Mercator projection

Rotation (Vr) (Vr)

The speed at which the pilot pulls back on the controls to lift the aircraft's nose during takeoff

Takeoff

The phase of flight in which an aircraft accelerates and becomes airborne

Technical Stop

An intermediate landing for refueling or maintenance rather than passenger purposes

Turnaround Time

The time required to unload, service, and reload an aircraft between arrival and departure

Wheels-Up Time

The moment an aircraft lifts off the runway and becomes fully airborne

Passenger Experience (22)

Airport Lounge

A premium waiting area offering comfortable seating, food, drinks, and amenities

Automated Passport Control (APC)

Self-service kiosks that expedite immigration processing for eligible passengers

Baggage Claim

The area in an airport where arriving passengers collect their checked luggage

Boarding

The process of passengers entering the aircraft before departure

Boarding Pass

A document providing authorization to board an aircraft for a specific flight

Carry-On Baggage

Luggage small enough to be stowed in the overhead bin or under the seat

Checked Baggage

Luggage surrendered at check-in to be transported in the aircraft's cargo hold

Check-In

The process of confirming a passenger's presence and obtaining a boarding pass

Customs

Government checkpoints where goods brought into a country are inspected and duties assessed

Denied Boarding

When a passenger with a confirmed reservation is not allowed to board due to overbooking

Duty-Free Shopping

Retail outlets in international departure areas exempt from local taxes and duties

Global Entry

A US Customs program for expedited clearance for pre-approved, low-risk travelers

Immigration

Border control points where passports and visas are checked for international arrivals

Minimum Connection Time (MCT)

The shortest allowed time between connecting flights at a specific airport

Oversale (Overbooking)

The airline practice of selling more tickets than available seats to account for no-shows

Passenger Name Record (PNR)

A record in the airline reservation system containing passenger itinerary and contact information

Pre-Clearance

US customs and immigration processing completed at a foreign airport before departure

Priority Boarding

Early aircraft boarding privilege given to premium class passengers or loyalty program members

Security Screening

The process of checking passengers and baggage for prohibited items before entering secure areas

Transfer

Changing from one flight to another at a connecting airport

Transit (Airside)

Remaining in the secure area of an airport between connecting flights without passing through immigration

Unaccompanied Minor (UM)

A child traveling without an adult passenger who receives special airline supervision

Airline Operations (20)

Airline Alliance

A partnership of airlines that cooperate on routes, frequent flyer programs, and lounge access

Available Seat Kilometer (ASK)

The total passenger capacity of an airline measured in seats multiplied by distance flown

Charter Airline

An airline that operates flights booked by travel agencies or tour operators rather than scheduled services

Codeshare

An agreement where two or more airlines share the same flight under different flight numbers

Dry Lease

An aircraft lease providing only the aircraft, without crew or operational support

Feeder Airline

A regional airline that transports passengers to and from a larger carrier's hub

Flag Carrier

An airline that is designated to represent and carry the flag of its home country

Grandfather Rights

The principle allowing airlines to retain airport slots based on historical usage

Hub-and-Spoke Model

An airline network model routing most flights through a central hub airport

Interline Agreement

An agreement allowing passengers to use a single ticket for journeys involving multiple airlines

Load Factor (LF)

The percentage of available seats on an aircraft that are filled with passengers

Low-Cost Carrier (LCC)

An airline operating with a lower cost structure and offering lower fares than full-service carriers

oneworld

A global airline alliance founded in 1999, members include American Airlines, British Airways, Qantas

Point-to-Point Model

An airline network model where flights connect cities directly without routing through a hub

Revenue Passenger Kilometer (RPK)

A measure of airline traffic calculated as passengers carried multiplied by distance flown

Slot (Airport Slot)

A scheduled time allocation for an airline to use airport infrastructure for takeoff or landing

Star Alliance

The world's largest airline alliance founded in 1997, members include United, Lufthansa, ANA

Ultra-Low-Cost Carrier (ULCC)

An airline with the most stripped-down fares, charging separately for nearly all services

Wet Lease

An aircraft lease that includes the aircraft, crew, maintenance, and insurance (ACMI)

Yield

Average revenue per passenger-kilometer, a key airline profitability metric

Aircraft & Engineering (24)

Auxiliary Power Unit (APU)

A small engine on the aircraft that provides electrical power and air conditioning on the ground

Avionics

The electronic systems used in aircraft including navigation, communication, and flight management

Bleed Air

Compressed air extracted from the jet engine compressor used for cabin pressurization and de-icing

Composite Materials

Advanced lightweight materials (carbon fiber, fiberglass) used in modern aircraft construction

Empennage (Tail Section)

The tail assembly of an aircraft including horizontal stabilizer, vertical fin, and control surfaces

ETOPS Rating

The certified maximum time a twin-engine aircraft may fly from a suitable diversion airport

Flight Management System (FMS)

A computer system that automates navigation, performance optimization, and flight planning

Fly-By-Wire (FBW)

A system replacing manual flight controls with electronic signals sent to actuators

Fuselage

The main body structure of an aircraft that holds crew, passengers, and cargo

Landing Gear

The undercarriage system of wheels, struts, and brakes supporting the aircraft on the ground

Mach Number (M)

The ratio of the aircraft's speed to the speed of sound in the surrounding atmosphere

Maximum Takeoff Weight (MTOW)

The maximum weight at which the pilot is allowed to attempt takeoff

Narrow-Body Aircraft

A single-aisle aircraft typically seating 100-240 passengers for short/medium-haul flights

Pressurization

The process of maintaining a safe atmospheric pressure inside the aircraft cabin at high altitudes

Range (Aircraft)

The maximum distance an aircraft can fly without refueling

Regional Jet (RJ)

A small jet aircraft typically seating 50-100 passengers for short-haul routes

Service Ceiling

The maximum altitude at which an aircraft can sustain a specified rate of climb

Stall Speed (Vs)

The minimum speed at which an aircraft can maintain level flight

Traffic Collision Avoidance System (TCAS)

An airborne system that detects other transponder-equipped aircraft and provides resolution advisories

Turbofan Engine

A jet engine that uses a ducted fan to produce thrust, the most common type on commercial aircraft

Turboprop

An aircraft powered by a gas turbine engine driving a propeller, efficient at lower speeds

Turboshaft Engine

A gas turbine engine optimized to produce shaft power, primarily used in helicopters

Wide-Body Aircraft

A twin-aisle aircraft typically seating 200-600 passengers for medium/long-haul flights

Winglet

A vertical or angled extension at the tip of an aircraft wing that reduces drag

Aviation Weather (18)

Ceiling

The height of the lowest layer of clouds covering more than half the sky

Clear Air Turbulence (CAT)

Turbulence occurring in cloudless areas, often near jet streams, invisible to radar

Crosswind

A wind blowing perpendicular to the direction of travel or runway alignment

Fog

Visibility-reducing water droplets suspended near the surface, a major cause of airport delays

Headwind

A wind blowing directly opposite to the direction of aircraft travel, reducing ground speed

Icing

The accumulation of ice on aircraft surfaces during flight through supercooled water droplets

Jet Stream

A narrow band of strong winds (100-200 kt) at high altitudes affecting flight times and routing

METAR (METAR)

Aviation Routine Weather Report — a standardized format for reporting current weather conditions

Pilot Report (PIREP)

An in-flight weather report provided by a pilot describing actual conditions encountered

QNH (QNH)

The atmospheric pressure adjusted to mean sea level, used for altimeter setting

SIGMET (SIGMET)

Significant Meteorological Information — a warning of severe weather hazardous to all aircraft

Tailwind

A wind blowing in the same direction as the aircraft's travel, increasing ground speed

Terminal Aerodrome Forecast (TAF)

A weather forecast for the area around an airport, typically covering a 24-30 hour period

Thunderstorm (Cumulonimbus) (CB)

A convective weather system producing lightning, turbulence, hail, and heavy precipitation

Turbulence

Irregular atmospheric motion causing sudden changes in an aircraft's altitude or attitude

Visibility (VIS)

The greatest distance at which prominent objects can be identified with the unaided eye

Volcanic Ash Cloud

Fine rock particles from volcanic eruptions that can damage jet engines and aircraft systems

Wind Shear

A sudden change in wind speed or direction over a short distance, hazardous during takeoff and landing

Safety & Regulations (22)

Airworthiness Certificate

An official document certifying that an aircraft meets safety standards and is fit to fly

Bird Strike

A collision between an airborne animal and an aircraft, posing risk to engines and windscreens

Black Box (Flight Recorder) (FDR/CVR)

The flight data recorder and cockpit voice recorder that capture flight parameters and audio

Controlled Flight Into Terrain (CFIT)

An accident where an airworthy aircraft is flown into terrain, water, or an obstacle

Crew Resource Management (CRM)

Training methodology that improves teamwork, communication, and decision-making among flight crew

Emergency Evacuation

The rapid deployment of passengers from an aircraft via emergency exits and slides

Emergency Exit

A specially designed door or window on an aircraft that can be opened quickly for evacuation

Enhanced GPWS (EGPWS)

An advanced terrain awareness system combining GPS data with a terrain database

European Union Aviation Safety Agency (EASA)

The EU agency responsible for civil aviation safety regulation

Federal Aviation Administration (FAA)

The US government agency responsible for regulating civil aviation

Fire Suppression System

Aircraft systems designed to detect and extinguish fires in engines, cargo holds, and lavatories

Ground Proximity Warning System (GPWS)

An aircraft system that alerts pilots when the aircraft is in dangerous proximity to terrain

International Air Transport Association (IATA)

The trade association representing airlines worldwide, managing codes and standards

International Civil Aviation Organization (ICAO)

The UN specialized agency managing international civil aviation standards and regulations

Life Vest

A personal flotation device stored under each aircraft seat for use in water emergencies

MAYDAY

The international distress signal indicating grave and imminent danger requiring immediate assistance

Notice to Air Missions (NOTAM)

A notice filed with aviation authorities to alert pilots of hazards or changes along a flight route

PAN-PAN

The international urgency signal indicating a condition requiring assistance but not immediate danger

Runway Incursion

Any occurrence involving unauthorized presence of an aircraft, vehicle, or person on a runway

Safety Management System (SMS)

A systematic approach to managing aviation safety including organizational structures and policies

Transportation Security Administration (TSA)

The US agency responsible for security of transportation systems, particularly airports

Wake Turbulence

Air disturbance caused by an aircraft's wingtip vortices, hazardous to following aircraft