- Cholera
- Chondola
- Christian Name
- Chronometer
- Chunnel
- Chute
- Cinque Ports
- Circle Trip
- Circuitous
- Circumference
- Cirque
- Cirrus
- City
- City Terminal
- Claring Bank
- Class
- Clay Pan
- Clearance
- Cleat
- Clerestory
- Climate
- Climatic Zones
- Clip-Joint
- Clip
- Cloakroom
- Club Class
- Co-Tidal Line
- Coach
- Coaming
- Coastguard
- Coastline
- Cockpit
- Cocktail
- Code Sharing
- Cog Railway
- Collision Damage Waiver
- Colonial
- Colours
- Commercially Important Person
- Commies
- Commission
- Commonwealth Of Independent States
- Common Carrier
- Communism
- Commuter
- Commuter Aircraft
- Companionway
- Compartment
- Compass
- Compensation
- Complement
- Complimentary Ticket
- Complimentary Upgrade
- Comprehensive
- Compressor
- Computerised Reservation System (Crs)
- Concierge
- Concourse
- Conditions Of Carriage
- Condominium
- Conducted Tour
- Conference
- Conference Terms
- Confidential Tariff
- Configuration
- Confirmation
- Conjunction Tickets
- Connecting Rooms
- Consequential Loss
- Conservation Area
- Consolidation
- Consolidator
- Constellation
- Consul
- Contents Table Of
- Continent
- Contour Lines
- Contour Map
- Contrail
- Contremarque
- Contribution
- Control Tower
- Conurbation
- Convention (I)
- Convertible
- Coracle
- Coral
- Cordillera
- Cordon Bleu
- Corduroy Road
- Corkage
- Corked
- Corniche
- Coromandel Coast
- Corona
- Corporate Rate
- Corridor
- Cossack
- Costa Blanca
- Costa Brava
- Costa Del Azahar
- Costa Del Sol
- Costa De La Luz
- Costa De Lisboa
- Costa De Prata
- Costa Dorada
- Costa Dourada
- Costa Verde
- Cote Dargent
- Cote Dazur
- Couchette
- Counterfoil
- Country
- County
- Coupe
- Coupon
- Courier
- Courtyard
- Cove
- Cover Charge
- Coxswain
- Credit Card
- Creole
- Croquat
- Cross-Border Ticketing
- Crossroad
- Cross Trees
- Cultural Attraction
- Culture
- Cumulus
- Curfew
- Currency Restrictions
- Customer Profile
- Customer Service
- Customs
- Cut-Off Date
- Cutting
- Cycle
- Cyclone
- Cylinder
- Cyrillic
- Daily Delegate Rate
- Dalmatia
- Danelaw
- Dark Continent The
- Davit
- Davy Jones Locker
- Daylight Saving
- Day Rate
- Dead Reckoning
- Debit Card
- Deck
- Deck Plan
- Decompression
- Decompression Sickness
- Decompression Tables
- Deep-Sea
- Deep South
- Degree
- Delivery Charge
- Delta
- Demographics
- Demurrage
- Denied Boarding Compensation
- Departure Delay Insurance
- Departure Tax
- Deportation
- Deposit Collection Advice
- Depression
- Depth Gauge
- Deregulation
- Desert
- De Luxe
- Diarise
- Diesel-Electric
- Diesel-Hauled
- Diesel Engine
- Diligence
- Dinner Jacket
- Directional Fare.
- Director General
- Direct Current
- Direct Service
- Disembark
- Disintermediation
- Dispatch Money
- Displaced Person
- Displacement Effect
- Distribution Channel
- Document
- Doldrums
- Dolphin Coast
- Domestic
- Double Booking
- Double Room
- Down Under
- Drag
- Drag Lift
- Draught
- Dress Code
- Drift
- Drive-In
- Drive-On
- Drop Off Charge
- Dry Dock
- Dry Lease
- Dry Suit
- Dumb Terminal
- Dune
- Duty-Free
- Duty-Free Allowance
- Duty-Free Shop
- Duty-Free Units
- Duty
- Duty Free Shop
- Dyke
- Earlybird
- Ear Clearing
- Easement
- East Greenland Current
- East Indies
- Easy Check-In
- Eatery
- Ebonics
- Economy Of Scale
- Ectaa
- Effendi
- Efficiency
- Elapsed Time
- Electrified
- Electronic Funds Transfer At Point Of Sale
- Electronic Ticketing
- Elevator
- Elsan
- El Nino
- Embassy
- Emerald Coast
- Empire
- End-On Construction
- Endemic
- Endorsement
- Engine
- Engineer
- English Riviera
- Entry Permit
- Environment
- En Bloc
- En Route
- Epidemic
- Equator