- ±6°
- 14 CFR
- 100-hour inspection
- A.C
- A/FD
- A-la-carte
- A la Carte Bar
- A&P
- AA
- ABC
- Abeam
- Above Ground Level (AGL)
- Absolute accuracy
- Absolute altitude
- Absolute Ceiling
- Absolute pressure
- AC
- ACAS
- Accelerate-go distance
- Accelerate-stop distance
- Accelerated Stall
- Acceleration
- Acceleration error
- Accelerometer
- Accessible Tourism
- Accessible Travel
- Accommodation
- Activities
- Actual Time of Arrival
- AD
- ADC
- Add-on
- ADF
- ADF (Automatic Direction Finder)
- ADI
- Adiabatic cooling
- Adiabatic heating
- Adiabatic Lapse Rate
- Adjoining rooms
- Adjustable-pitch propeller
- Adjustable stabilizer
- ADM
- Adoption Rate
- ADS-B
- ADT
- Advance Purchase Fare
- Advance purchase requirement
- Advection fog
- Adventure tour
- Adventure travel
- Adventure Traveler
- Adverse yaw
- aerodrome
- Aerodynamics
- aerodyne
- aeronaut
- Aeronautical chart
- Aeronautical Decision-Making
- Aeronautical decision-making (ADM)
- Aeronautical Information Manual
- Aeronautical Information Manual (AIM)
- aeroplane
- aerostat
- AF
- Affiliated Aircraft
- Affinity Card
- Affinity group
- Aft
- After-departure charge
- Agent
- AGL
- Agonic line
- Agreement Aircraft
- AHRS
- AI
- Aileron
- ailerons
- AIM
- AIM (Aeronautical Information Manual)
- AIO variables
- air base
- Air Crewmember Essential for the Mission
- Air data computer (ADC)
- Air Defense Identification Zone (ADIZ)
- air force
- Air mass
- Air mile
- Air route surveillance radar (ARSR)
- Air route traffic control center (ARTCC)
- Air-Sea
- Air Speed Indicator (ASI)
- Air Taxi Operator
- Air Traffic Control (ATC)
- Air traffic control radar beacon system (ATCRBS)
- Air Travel
- Air Travel Card
- Airalo
- Aircraft
- Aircraft Accident
- Aircraft Acquisition
- Aircraft age
- Aircraft altitude
- Aircraft approach category
- Aircraft Incident
- Aircraft lessor
- Aircraft livery
- Aircraft type
- Airfoil
- Airline
- Airline Alliance
- Airline fare
- Airlines Reporting Corporation (ARC)
- airman
- Airmen’s Meteorological Information (AIRMET)
- AIRMET
- airplane
- Airplane Flight Manual (AFM)
- Airplane Owner/Information Manual
- airport
- Airport access fee
- Airport code
- Airport Codes
- Airport diagram
- Airport/Facility Directory (A/FD)
- Airport surface detection equipment (ASDE)
- Airport surveillance radar approach
- Airport surveillance radar (ASR)
- Airport Tax
- Airport transfer
- airship
- Airspace Classes
- Airspace Conflict
- Airspeed
- Airspeed indicator
- airstair
- Airtanker
- Airway
- Airworthiness
- Airworthiness Certificate
- Airworthiness Directive
- Airworthiness Directive (AD)
- Alert area
- All Inclusive
- All-inclusive package
- All-inclusive resort
- Alliance
- Almanac data
- Alpha Code
- ALS
- Alternate airport
- Alternate static source
- Alternate static source valve
- Alternative Tourism
- Alternative Travel
- Altimeter
- Altimeter Setting
- Altitude
- Altitude engine
- Altitude indicator
- Alumni tour
- AM
- Ambassador
- Ambient pressure
- Ambient temperature
- AME
- Amendment status
- Amenities
- Amenity
- Amenity kit
- Amenity package
- American plan
- AMEX
- Amidships
- Ammeter
- AMT
- an airplane. ELT
- Aneroid
- Aneroid barometer
- Angle of attack
- Angle of Incidence
- Anhedral
- Anniversary travel
- Annual inspection
- Antebellum
- Anti-ice
- Antiservo tab
- APEX
- Approach
- Approach control
- Approach lighting system (ALS)
- Apron
- ARC
- Archipelago
- Area chart
- Area forecast (FA)
- Area navigation (RNAV)
- Arm
- ARSR
- ARTA
- Artificial horizon
- AS
- ASC Fee
- ASOS
- Aspect ratio
- ASR
- AST
- ASTA
- Asymmetric thrust
- AT
- ATC
- ATC (Air Traffic Control)
- ATCRBS
- ATIS
- ATIS (Automatic Terminal Information Service)
- Atmospheric propagation delay
- ATO
- Attitude
- Attitude and heading reference system (AHRS)
- Attitude director indicator (ADI)
- Attitude Heading Reference System (AHRS)
- Attitude indicator
- Attitude instrument flying
- Attitude management
- Attractions
- Audio Control Panel (ACP)
- Autobahn
- Autogiro or autogyro
- autogyro
- Autokinesis
- Automated Surface Observing System (ASOS)
- Automated Weather Observing System (AWOS)
- Automatic dependent surveillance—broadcast (ADS–B)
- Automatic Direction Finder
- Automatic direction finder (ADF)
- Automatic Direction Finding (ADF)
- Autopilot
- Auxiliary fuel pump
- Auxiliary power unit (APU)
- Availability
- available seat miles
- available ton miles (ATMs)
- Average room rate
- AVGAS
- Aviation Alphabet
- Aviation Hazard
- Aviation medical examiner (AME)
- Aviation Routine Weather Report (METAR)
- aviator
- aviatrix
- Avionics
- Avionics master switch
- AWIS
- AWOS
- Axes of an aircraft
- Axial flow compressor
- AY
- AZ
- Azimuth
- Azimuth card
- B&B
- Babymoon
- Back course (BC)
- Back to back
- Back-to-back ticket(ing)
- Backpack
- Backpacker
- Backpacking
- Baggage Allowance
- Baggage handler
- Baggage master
- Balance tab
- Balcony
- balloon
- Bar
- Barbecue facilities
- Barge cruising
- Baro-aiding
- Barometric altitude
- Barometric scale
- Base
- Base fare
- Base leg
- Baseline
- Basic empty weight (GAMA)
- BC
- Beach holiday
- Beam
- Bearing
- Bed and breakfast (B&B)
- Bell captain
- Bellboy
- Bellman
- Benelux
- Bernoulli’s Principle
- Berth
- Bespoke tour
- Best lift over drag ratio
- Biking Trips and tours
- biplane
- Biplanes
- Birthday travel
- Black Box
- Black boxes
- Black Friday
- Blackout dates
- Blade angle
- Bleed air
- blimp
- Block
- Block altitude
- Block time
- Blocked space
- Boarding
- Boarding pass
- bomber
- Booking.Com
- Booking form
- Booking Number
- Boutique hotel
- Bow
- Break-even point (BEP)
- Break-even pricing
- Breakage
- breakeven load factor
- Breakfast buffet
- Bridal suite
- Bridge
- Bucket List
- Bucket list destination
- Bucket list destinations
- Budget-friendly travel
- Buffet breakfast
- Bulk contract
- Bulk fare
- Bulkhead
- Bulkhead Seat
- Bumping
- Bunkbed
- Bureau
- Busbud
- Business class
- by impact forces, automatically turns it on. Emergency overrun
- Bypass ratio
- Cabin
- Cabin-(Aircraft)
- Cabin altitude
- Cabin Crew
- Cabin steward
- Cage
- Calibrated
- Calibrated airspeed (CAS)
- Calibrated orifice
- Call sign
- Camber
- Campervan
- Camping
- Canard
- Canard configuration
- Cancellation fee
- Cancellation penalty
- Cantilever
- Cape
- Captain
- Carbon monoxide
- Card mill
- Cargo
- carried in an aircraft to help locate it in the event of a crash. A special switch, activated
- Carrier
- Carry on
- Carry-On Baggage
- CAS
- Cashless cruising
- Casual research
- CAT I/II/III approaches
- CAVU
- CAVU (Ceiling and Visibility Unlimited)
- Cay
- CDI
- CDW
- Ceiling
- Ceiling and Visibility Unlimited
- Celebrity Travel
- Center of gravity (CG)
- Center of pressure
- centerline. The final approach normally extends from the base leg to the runway. Fixed Base Operator (FBO)
- Centrifugal flow compressor
- Centrifugal force
- Centripetal force
- Certified Tour Professional (CTP)
- Certified Travel Associate
- Certified Travel Counselor (CTC)
- Certified Travel Industry Specialist (CTIS)
- CG
- Chain-ratio method
- Chamber of commerce
- Chancery
- Change of equipment
- Changeover point (COP)
- Chart Supplement U.S
- Charter
- Charter service
- Chauffer driven tours
- Check-In
- Check-Out
- Checked Luggage
- Checklist
- Checkride
- chord
- Chord line
- Chunnel
- Circle itinerary
- Circle trip
- Circling approach
- City guide
- City Pair
- City tour
- City trip
- Civil Aviation Administration of China
- Civil Aviation Authority (CAA)
- Class A airspace
- Class B airspace
- Class C airspace
- Class D airspace
- Class E airspace
- Class G airspace
- Class of Service
- Clean configuration
- Clear ice
- Clearance
- Clearance delivery
- Clearance limit
- Clearance on request
- Clearance void time
- CLIA
- Client list
- Client mix
- Climb
- Closed-end question
- Closeout
- Co-op tour
- Coach
- Cockpit
- Cockpit voice recorder (CVR)
- Codeshare flight
- Coefficient of lift (CL)
- CofA
- Coffee bar
- Cold front
- Collision damage waiver-(CDW)
- Commercial Aviation
- Commission
- Commission cap
- Commissionable tour
- Common carrier
- Common Traffic Advisory Frequency (CTAF)
- Commuter
- Comp policy
- Compass course
- Compass locator
- Compass rose
- Complex aircraft
- Complimentaries (comps)
- Compression bag
- Compressor pressure ratio
- Compressor stall
- Computer navigation fix
- Computerized reservation system (CRS)
- Concentric rings
- Concierge
- Concierge Level
- Condensation
- Condensation nuclei
- Conditions
- Cone of confusion
- Configuration
- Confirmed reservation
- Confluence
- Conflux
- Connecting Flight
- Connecting room
- Consolidation
- Consolidator
- Consortium
- Constant-Speed Propeller
- Consul
- Consulate
- Consumer
- Consumer protection plan
- Consumption constraints
- Continent
- Continental breakfast
- Continental climate
- Continuous flow oxygen system
- Contract
- Contract Aircraft
- Contrail
- Contrails
- Control and performance
- Control display unit
- Control pressures
- control surface
- control tower
- Controllability
- Controllable-pitch propeller (CPP)
- Controlled airspace
- Convective SIGMET
- Convective weather
- Convenience sample
- Convention and Visitors Bureau (CVB)
- Conventional landing gear
- Cooperative (co-op) advertising
- Cooperator Aircraft
- Coordinated flight
- Coordinated Universal Time (UTC)
- Coordinated Universal Time (UTC) –A standard time corresponding to the local time for the zone beginning at the meridian through Greenwich England. It is corrected for seasonal variations in the earth’s rotation about the sun. By international agreement i
- COP
- Coriolis illusion
- Corporate agency
- Corporate Rate
- Corporate Travel
- Cost index
- cost per available seat mile
- Cost-plus pricing
- Costing
- Couchette
- Coupled ailerons and rudder
- Coupon
- course
- Course deviation indicator
- Course Deviation Indicator (CDI)
- Covid-19
- Cowl flaps
- crab
- Crew resource management (CRM)
- Critical altitude
- Critical angle of attack
- Critical areas
- CRM
- Cross-check
- Cross-Country Flight (XC)
- Crosswind
- Crosswind leg
- Cruise
- Cruise clearance
- Cruise Tour
- CST
- CTA
- CTAF
- Cuisine
- Culinary Tourism
- Cultural Tourism
- Cultural Travel
- Culture
- Current induction
- Custom Tour
- Customer
- Customized tour
- Customized tours
- Customs
- CVB
- Cyber Monday
- D.C
- DA
- Dark adaptation
- Database
- Datum (Reference Datum)
- Day rate
- Day tour
- De-icing
- Dead reckoning
- Dead reckoning (DR)
- Deadheading
- Deadstick
- Deal
- Debark
- Deceleration error
- Decision altitude (DA)
- Decision height (DH)
- Deck
- Deck plan
- Deice
- Delivery flight
- Delta
- Delta wing
- Demand-based pricing
- Demand generators
- Demands
- Demographics
- Denied-boarding compensation
- Density altitude
- Department of State
- Departure control
- Departure leg
- Departure point
- Departure procedure (DP)
- Departure tax
- Deplane -To disembark, or get off, a plane.
- Deposit
- Deposit policy
- Deposition
- Descent
- Descriptive research
- Destination
- Destination alliance
- Destination management company (DMC)
- Destination marketing organization (DMO)
- Destination wedding
- Destination Weddings
- Detonation
- Deviation
- Dew
- Dewpoint
- DGPS
- DH
- Diet menu
- Differential ailerons
- Differential Global Positioning System (DGPS)
- Differential pressure
- Dihedral
- dihedral angle
- Diluter-demand oxygen system
- Dine-around-plan
- Dip error
- Direct access
- Direct Flight
- Direct indication
- Direct marketing
- Direct User Access Terminal Service (DUATS)
- Direct User Access Terminal System (DUATS)
- Directional stability
- dirigible
- Disaster Tourism
- Disclaimer
- Displaced threshold
- Distance circle
- Distance measuring equipment (DME)
- Distress
- diverting
- DMC
- DME
- DME arc
- Docent
- DOD
- Dogfight
- Doghouse
- Domestic airport
- Domestic fare
- Domestic Reduced Vertical Separation Minimum (DRVSM)
- Domestic travel
- Dormitory
- Double booking
- Double Double
- Double gimbal
- Double occupancy
- Double occupancy rate
- Double Room
- Double-room rate
- Downgrade
- Downwash
- Downwind leg
- DP
- DR
- Drag
- Drag curve
- Drift angle
- Driver-guide
- Driver guided tours
- Drop-off charge
- DRVSM
- dry lease
- Dual-Function Pilot
- DUATS
- Duplex
- Dutch roll
- Duty-Free
- Duty-free imports
- Dynamic hydroplaning
- Dynamic stability
- E-ticket
- Early Check-In
- EASA
- Eco-Conscious Travel
- Eco-friendly travel
- Eco/Sustainable Tourism
- Economic impact study
- Economy Class
- Ecotour
- Ecotourism
- Eddy current damping
- Eddy currents
- Educational tour
- EFC
- Elder hostel
- Electronic Boarding Pass
- Electronic flight display (EFD)
- Electronic ticket
- Elevator
- Elevator illusion
- elevons
- EM wave
- Embark
- Emergency
- Emergency overrun
- Empennage
- Emphasis error
- Empty-field myopia
- En route facilities ring
- En route high-altitude charts
- En route low-altitude charts
- En-suite
- Encoding altimeter
- End suite
- Engine
- Engine pressure ratio (EPR)
- English breakfast
- Entertainment program
- Environmental scanning
- EPR
- Equal time point (ETP)
- Equilibrium
- Equivalent airspeed
- Errors and Omissions Insurance
- Escort
- Escorted group tour
- Escrow accounts
- EST
- Estimated time en route
- Estimated time of arrival
- Estimated time of arrival (ETA)
- estimated to elapse for an aircraft to arrive at its destination or checkpoint.
- Estimations
- Estuary
- ETA
- ETD
- ETE
- Ethnicity
- Ethno-Tourism
- Eurailpass
- Eurocontrol
- European plan
- European Union Aviation Safety Agency (EASA)
- Evaporation
- Exchange order
- Exchange rate
- Exclusive fare
- Excursion
- Excursion Fare
- Executive suite
- Exhaust gas temperature (EGT)
- Exhibition
- Exotic Travel
- Expat
- Expect-further-clearance (EFC)
- Experiential Travel
- Exploratory research
- Explosive decompression
- Extended Mode S
- Extended Range Operations (ETOPS)
- Extension
- Extensions may occur before, during, or after the basic travel program.
- °F)
- F/O
- FA
- FAA
- Facilities
- FAF
- False horizon
- FAM (familiarization) tour
- Familiarity Tour
- Family plan
- Family Vacation
- Familymoon
- Fare Aggregator
- Fare Basis
- Fare basis (code)
- FARs
- Fatal Injury
- FBO
- FDI
- feather
- Feathering
- Federal airways
- Federal Aviation Administration (FAA)
- Federal Aviation Authority
- Federal Aviation Authority (FAA)
- Federal Aviation Regulations
- Feeder facilities
- Ferry Flight
- Final approach
- Final approach fix (FAF)
- Final Boarding Call
- Firewall
- First Aid
- First class
- First Officer
- Fishing Trips and tours
- FIT
- Five by five
- Fixating
- Fixed Base Operator
- Fixed Base Operator (FBO)
- Fixed-pitch propellers
- Fixed slot
- Fjord
- FL
- Flameout
- Flaperon
- Flaps
- Flare
- FLARM
- Flashpacker
- Flight Attendant
- Flight Bag
- Flight Computer
- Flight configurations
- Flight Crew
- Flight Crewmember
- Flight data recorder (FDR)
- Flight deck
- Flight director indicator (FDI)
- Flight Information Region (FIR) / Upper Information Region (UIR)
- flight level
- Flight level (FL)
- Flight management system (FMS)
- Flight number
- Flight path
- Flight patterns
- Flight plan
- Flight Service Station (FSS)
- Flight strips
- Floor load limit
- Fly-drive package
- Fly/drive tour
- Flying Dirty
- FMS
- FOD
- Fog
- Folio
- Force (F)
- Forced Landing
- Fore
- Foreign object damage (FOD)
- Form drag
- Frequent Flier
- Frequent Flier Program
- Frequent Flyer Program
- Frequent Independent travel (F.I.T.)
- Frise-type aileron
- Front
- Frost
- FSDO
- FSS
- Fuel jettison / fuel dumping
- Fuel load
- Fuel tankering
- Full house
- Full Pension / full board
- Full service hotel
- Full stall
- Fun park
- Function room
- Fundamental skills
- Funnel flight
- Fuselage
- G-Adventure
- Galley
- GAMA
- Gate
- Gate-Airport
- Gateway
- GDS
- General Aviation
- George
- Geotourism
- Gift shop
- Gimbal ring
- Glamping
- Glass Cockpit
- Glide ratio
- glider
- glideslope
- Glideslope (GS)
- Glideslope intercept altitude
- Global distribution system (GDS)
- Global landing system (GLS)
- Global navigation satellite system (GNSS)
- Global positioning system (GPS)
- GLS
- GNSS
- Go-Around
- Gone Tech
- Goniometer
- GPS
- GPS Altitude
- GPS Approach Overlay Program
- GPWS
- Graduation travel
- Graveyard spiral
- Great circle route
- Greenwich Mean Time (GMT)
- Gross Registered Tonnage (GRT)
- Gross Weight
- Ground adjustable trim tab
- Ground control
- Ground Effect
- Ground Mishap, Aircraft Ground Mishap
- Ground operator
- Ground proximity warning system (GPWS)
- Ground speed
- Grounding
- Groundspeed
- Group
- Group leader
- Group rate
- Group tour
- Group Travel
- GS
- GST
- Guaranteed share
- Guaranteed tour
- Guest account
- Guest houses
- Guest ranch
- Guide or guide service
- Guided tour
- Gull Wing Flying Wing
- GWPS
- Gyro
- Gyroscope
- Gyroscopic precession
- HAA
- HAL
- Half pension
- Hand-off
- Handshake
- Hangar
- Hard-copy
- HAT
- Hazard, Aviation Hazard
- Hazardous attitudes
- Hazardous Inflight Weather Advisory Service (HIWAS)
- Head tax
- Head-up display (HUD)
- Heading
- Heading bug
- Heading indicator
- Headwork
- Heavy
- Height above airport (HAA)
- Height above landing (HAL)
- Height above touchdown elevation (HAT)
- helicopter
- Heritage trail
- HF
- Hg
- Hidden-city ticketing
- Hideaway
- HIGE
- High performance aircraft
- High Performance Airplane
- High Reconnaissance
- High season
- Hiking Trips and tours
- Histotoxic hypoxia
- HIWAS
- HOGE
- Holafly
- Hold bars
- Hold line
- Holding
- Holding pattern
- Homing
- Honeymoon
- Honeymoon Travel
- Horizontal component of lift
- Horizontal situation indicator (HSI)
- Horizontal stabilizer
- Horsepower
- Hosted group tour
- Hostel
- Hot start
- Hotel
- Hotspot
- House
- Hover Landings
- HSI
- Hub
- Hub-and-spoke itinerary
- HUD
- Human factors
- Hung start
- Hurricane season
- Hydroplaning
- Hypemic hypoxia
- Hyperventilation
- Hypoxia
- Hypoxic hypoxia
- IAF
- IAP
- IAS
- IATA
- IATAN
- ICAO
- ICAO 24-bit Address (Hex Code)
- Ident
- Idle cutoff
- IDT
- IFR
- IFR Aircraft/IFR Flight
- Ignition switch
- ILS
- ILS categories
- ILS Category I: Provides for approach to a height above touchdown of not less than 200 feet, and with runway visual range of not less than 1,800 feet.
- ILS Category II: Provides for approach to a height above touchdown of not less than 100 feet and with runway visual range of not less than 1,200 feet.
- ILS Category IIIA: Provides for approach without a decision height minimum and with runway visual range of not less than 700 feet.
- ILS Category IIIB: Provides for approach without a decision height minimum and with runway visual range of not less than 150 feet.
- ILS Category IIIC: Provides for approach without a decision height minimum and without runway visual range minimum.
- IMC
- Immigration
- In-flight entertainment
- In-flight Service
- In season
- In transit
- Inbound operator
- Inbound tour
- Incentive or incentive commission
- Incentive tour
- Incentive travel
- Incident
- Incident with Potential (IWP)
- Incidental Charge
- Incidentals
- Incipient spin
- Inclinometer
- Inclusive tour
- Independent tour
- Indicated airspeed (IAS)
- Indicated airspeed (IAS) –The direct reading of the airspeed indicator uncorrected for variations in atmospheric density, installation or instrument error.
- Indicated altitude
- Indirect indication
- Induced angle of attack
- Induced drag
- Induction icing
- Inertial navigation system (INS)
- Infinity pool
- Infrastructure
- Initial approach fix (IAF)
- Inoperative components
- INS
- Inside cabin
- Inspector
- Instantaneous vertical speed indicator (IVSI)
- Instrument approach procedures (IAP)
- Instrument Flight Rules
- Instrument flight rules (IFR)
- Instrument Landing System
- Instrument landing system (ILS)
- Instrument meteorological conditions (IMC)
- Instrument Meterological Conditions (IMC)
- Instrument takeoff
- Integrated Standby Flight Display (IFSD)
- Intercontinental
- Intercooler
- Interference drag
- Interline connection
- Intermodal tour
- International Air Transport Association
- International airport
- International Civil Aviation Organization (ICAO)
- International Date Line
- International Rate Desk
- International standard atmosphere (IAS)
- Interpolation
- Inversion
- Inversion illusion
- Inverter
- Involvement device
- Island hopping
- Island life
- Isobars
- Isogonic lines
- It can also be used in hotels. In this situation, the client goes to the hotel reception, presents identification documents, and receives a key to their hotel room.
- Itinerary
- IVSI
- Jet
- jet bridge
- Jet Lag
- Jet route
- Jet stream
- Jetway / Air bridge
- Joint fare
- Jones Act
- Joystick
- Judgment
- Judgment sample
- Jump Seat
- Junior suite
- KCAS
- KIAS
- Kid-friendly hotel
- Kilometer
- Kinderhotels
- King room
- King size bed
- Kneeboard
- Knot
- Kollsman window
- Kph
- KTAS
- L/MF
- LAAS
- Lag
- Laminar-Flow Airfoil
- Land arrangements
- Land as soon as possible
- Land as soon as practical
- Land breeze
- Land Destinations
- Land immediately
- Land-only
- Land operator
- Land Transfers
- Landing gear
- Large Helicopter
- Last-seat availability
- Late booking fee
- Late Checkout
- Lateral axis
- Lateral stability (rolling)
- Latitude
- Layover
- LDA
- LDW
- LDW - loss damage waiver
- Lead-in price
- Lead radial
- Leading edge
- Leading edge devices
- Leading-edge flap
- Leans, the
- Leeward
- Leg
- Leisure travel
- Letter of agreement
- Level flight
- Licensed empty weight
- Lido deck
- Lift
- Lift over drag ratio
- Lighter-than-air craft (LTA craft)
- Limit load factor
- Limited service hotel
- Lineman
- Lines of flux
- List broker
- LMM
- Load factor
- Load Factor (g)
- load factor (LF)
- Loadmeter
- LOC
- Local area augmentation system (LAAS)
- Local controller
- Localizer (LOC)
- Localizer-type directional aid (LDA)
- Locater map
- Locator middle marker (LMM)
- Locator outer marker (LOM)
- Lodge
- Lodging
- Logistics
- LOM
- Long-haul flight
- Long Range Navigation (LORAN)
- Longitude
- Longitudinal axis
- Longitudinal stability
- Longitudinal stability (pitching)
- Low or medium frequency
- Low season
- Lower (bed)
- Lowest available fare
- Lowest fare
- Loyalty program
- Lubber line
- Luggage storage
- Luxury class
- Luxury Cruise
- Luxury Ocean Cruise
- Luxury River Cruise
- Luxury travel
- Luxury vacations
- MAA
- MAC
- Mach
- Mach meter
- Mach number
- Macro-environment
- Magnetic bearing (MB)
- Magnetic Bearing To
- Magnetic compass
- Magnetic Deviation
- Magnetic dip
- Magnetic heading (MH)
- Magnetic North
- Magnetic variation
- Magneto
- Magnus effect
- Maintenance Deficiency
- Management Company
- Mandatory altitude
- Mandatory block altitude
- Maneuverability
- Maneuvering Characteristics Augmentation System (MCAS)
- Maneuvering speed
- Maneuvering speed (VA)
- Manifest
- Manifold absolute pressure
- Manufacturer's serial number (MSN)
- MAP
- Margin identification
- Marker beacon
- Market
- Market demand
- Market forecast
- Marketing mix
- Marketing plan
- Marketing research
- Markup
- Markup pricing
- Mass
- Master account
- Master switch
- Maximum altitude
- Maximum authorized altitude (MAA)
- Maximum elevation figure (MEF)
- Maximum landing weight
- Maximum ramp weight
- Maximum stay
- Maximum takeoff weight
- Maximum weight
- Maximum zero fuel weight (GAMA)
- mayday
- MB
- MCA
- Mean aerodynamic chord (MAC)
- Mean Sea Level
- Mean sea level (MSL)
- Media
- Medical Attention
- Medium Helicopter
- Meet and greet
- Meet-and-greet service
- Meeting/conference tour
- MEF
- MEL
- Meridian
- Meridians
- Mesophere
- metaplane
- METAR
- MFD
- MH
- MHz
- Microburts
- Microenvironment
- Microwave landing system (MLS)
- Midships
- Mileage breakdown
- Military Aircraft
- Military operations area (MOA)
- Military training route (MTR)
- Minibar
- Minimalism
- Minimum altitude
- Minimum connect time
- Minimum crossing altitude (MCA)
- Minimum descent altitude (MDA)
- Minimum drag