Airlines:
Adria Airways
Aer Lingus
Aero Continente
Aerocaribe
Aeroflot
Aerolineas Argentinas
Aerolitoral
AeroLloyd
Aeromar
Aeromexico
Aerosur
Aerosweet Airlines
Air 2000
Air Alma
Air Anatolia
Air Andaman
Air Aruba
Air Atlanta Icelandic
Air Austral
Air Baltic
Air Caledonie
Air Canada
Air China
Air Engiadina
Air Fiji
Air France
Air Gabon
Air Iceland
Air Jamaica
Air Kenya
Air Labrador
Air Lanka
Air Lithuania
Air Macau
Air Malta
Air Mandalay
Air Mauritius
Air Nauru
Air Negril
Air New Zealand
Air Niugini
Air Nova
Air Ontario
Air Pacific, Ltd.
Air Philippines
Air Promotion Group
Air Seychelles
Air Srpska
Air Zimbabwe
Air-Tech Ltd
AirALM
AirAsia
AirTran
Alaska Airlines
Alitalia
All Nippon Airways
Aloha Airlines
America West Airlines
American Airlines
American Trans Air
Ansett
Arctic Circle Air Service
Arkia Israeli Airlines
Asiana Airlines
Atlantic Airways
Atlantic Coast Airlines
Austin Express
Austrian Airlines
Aviacsa
Avianca
Bahamasair
Bangkok Airways
Bearskin Airlines
Bellview Airlines
Bhoja Air
Big Sky Airlines
Bouraq Indonesia Airlines
Braathens
Britannia Airways
British Airways
British Midland
BWIA International Airways
Calm Air
Canada 3000 Airlines Ltd.
Canadian Airlines International Ltd.
Cape Air and Nantucket Airlines
Cathay Pacific Airways
Cayman Airways
Cebu Pacific Air
Chautauqua Airlines
Chelan Airways
Chicago Express Airlines/ATA
China Airlines
China Eastern Airlines
China Northern Airlines
China Southern Airlines
CityBird
Colgan Air
Comair
Condor Flugdienst
Continental Airlines
COPA Airlines
Corsair
Croatia Airlines
Crossair
Cubana
Cyprus Airways
Cyprus Turkish Airlines
Czech Airlines
Daallo Airlines
Delta Air Lines
Dragon Air
Eastair Ltd.
easyJet
Egypt Air
El Al Israel Airlines
Emirates Airlines
Euroscot Express
Eurowings Luftverkehrs AG
EVA Air
Expedition Airways
Fine Air
Finnair
First Air
Flying Enterprise
Freedom Air International
Frontier Airlines
Ghana Airways
GMG Airlines
Go Fly Limited
Great Lakes Aviation, Ltd.
Greenlandair Inc.
Grupo Taca
Gulf Air
Gulfstream International Airlines
Haines Airways
Hawaiian Airlines
Helijet Airways
Iberia Airlines
Icelandair
Indian Airlines
Iran Airlines
Island Air - Belize
Island Airlines Nantucket
Japan Air System Co., Ltd.
Japan Airlines
JAT
Jersey European Airways
Jet Airways
JetBlue Airways
Keenair
Kenmore Air
Kenya Airways 
KLM Royal Dutch Airlines
Kootenay Airways, Ltd.
Korean Air
Kuwait Airways
Lauda Air
Lithuanian Airlines
LOT Polish Airlines
LTU International Airways
Lufthansa
Luxair Airlines
Lynx Air International
Mahalo Air
Malaysia Airlines
Malev
Manx Airlines.
Martinair
Maya Airways
MBA Ltd. Airlines of Papua New Guinea
Mesa Air Group, Inc.
Mesaba Airlines
MIAT Mongolian Airlines
Middle East Airlines - Air Liban s.a.l.
Midway Airlines
Midwest Express Airlines
Montair Aviation Inc.
Mountain Air Express
Myanmar Airways International (MAI)
Nantucket Airlines
National Airlines
National Aviation
Necon Air
Nordeste Linhas Aιreas
Northwest Airlines
Northwest Seaplanes
Olympic Airways
Orca Air
Pacific Wings
Pakistan International
Palestinian Airlines
Pan American World Airways
Pantanal Linhas Aereas
Philippine Airlines
Polynesian Airlines
Precision Air
Qantas Airways
Riga Airlines
Roan Air
Royal Air Maroc
Royal Brunei Airlines
Royal Nepal Airlines
Ryanair
SA Alliance Air
Sabena Airlines
SAS
Sata - Air Aηores
Saudi Arabian Airlines
Seair
Shandong Airlines
Shanghai Airlines
Shuttle America
Sichuan Airlines
Singapore Airlines
Skyways
Skywest Airlines - Australia
Skywest Airlines
Solomon Airlines
South African Airways
Southwest Airlines
Spanair
Spirit Airlines
Spirit Airlines Australia
SriLanken Airlines
Sun Country Airlines, Inc.
Sunflower Airlines
SunJet.
Swissair
Tahoe Air
Tap Air Portugal
Tarom Romanian Air Transport
Thai Airways International
Tie Aviation
TimAir Limited
Tower Air, Inc.
Trans Air Congo
Trans Mediterranean Airways
Trans States Airlines
Transbrasil
Travelair
Tropic Air
Turkish Airlines
TWA
Ukraine International Airlines
United Airlines
US Airways
Uzbekistan Airways
Vanguard Airlines
VARIG
VASP Brazilian Airline
Vietnam Airlines
Virgin Atlantic Airways
Virgin Express
Western Airlines
WestJet Airlines
Widerψe Airline
Wiggins Airways
World Airways
Yemen Airways
Yemenia
Yute Air Alaska

Buses & Trains:
Amtrak – Limited national service
Bonanza – Serves the northeast USA
C&J Trailways – Maine, NH, Mass
Concord Trailways – From Maine to Boston
Greyhound Lines – National service
Peter Pan – Serves the upper east coast USA

Cruise Lines:
American Cruise Line
Bora Bora Cruises
Carnival Cruise Lines
Celebrity Cruises
Costa Cruise Lines
Cruise West
Crystal Cruises
Cunard Line
Disney Cruise Line
First European Cruises
Fred.Olsen Cruise Lines
Holland America Line
MSC Italian Cruises
Norwegian Coastal Voyage
Norwegian Cruise Line
Orient Lines
Princess Cruises
Radisson Seven Seas Cruises
Regal Cruises
Royal Caribbean International
Royal Olympic Cruises
Seabourn Cruise Line
Silversea Cruises
Swan Hellenic Cruises
Windjammer Barefoot Cruises
Windstar Cruises

See Also:
Cruise Lines International Association
National Association of Cruise Oriented Agencies

Travel Health Links:
Air Ambulance America
American Society of Tropical Medicine and Hygiene
Centers for Disease Control - Travelers’ Health
HealthyTravelOnline
International Society of Travel Medicine
Medical Advisory Services for Travelers Abroad
MedJet Assistance
World Health Organization

Travel Agent Associations:
American Society Of Travel Agents
Association of Retail Travel Agents
Institute of Certified Travel Agents

Reservations Sites:
BusinessTravel.com – Not only a great booking site, but numerous articles and travel helps as well
CheapTickets.com
CheapTripsOnline
Expedia
Hotel-Bargains.net
HotelReservations.com
Orbitz
The Virtual Tourist
Travelocity
Travelzoo

Travel Guides:
AOL Travel
BusinessTravel.com
City Travel Guides – About 50 destinations discussed
Concierge.com
CNN Travel
GoNOMAD
IndependentTraveler.com
Open Directory: Travelogues – A great resource
Smart Pages: City Guides – Good resource for major cities, and CA, CT & TX
The Traveler
USA Today Travel Guide
World Travel Guide.Net

Miscellaneous:
Aerolink - Links to airlines and airports worldwide
Airline Quality Rating - Annual airline quality ratings from University of Nebraska, Omaha
Airports America - Travel information for air travelers
Airport Codes - Nearly 9,000 3 letter codes for airports worldwide
AirSafe.com
All Go Here - Lists hotels and airlines that are accessible by people with disabilities
Aviation Consumer Protection Home Page
Birth Certificate Passports.com - Helping you obtain your birth certificates & passport
Bureau of Consular Affairs – Travel assistance, warnings and guidelines from the US Dept. of State
City & Area Transit Guides - A useful, non-commercial site
Commuter Railroads - Maps and schedules for selected cities worldwide
eHows: Travel Tips - Good tips about travel, foreign cultures, local travel tips abroad, etc.
eHows: Trip Preparation – Good information, targeted to specific destinations
ExchangeHomes.com – Here’s one way to have a great vacation!
FamilyTravelGuides – Family travel tips, regional travel articles and guides, etc.
Flying With Kids - Infant air travel advice for families flying with a baby or  pre-school age children
FlyteComm - Track the status of any flight arriving or departing the United States or Canada. Updated every 5 minutes
Foreign Languages For Travelers - A travelers' basic phrase site using text and audio files
FXConverter - (Foreign Exchange Currency Converter) A multi-lingual Currency Converter with up to date exchange rates for 164 currencies
GlobalPassports.com - Assisting travelers in obtaining passports and visas
Home Exchange & Rental Homes
International Driver’s Licenses
International Travel & Health - A book AND a website, you would do well to read this site if you are headed anywhere abroad! Rail Connection - European Rail Travel
Smart Pages: Driving Directions - From here to there, maps and complete driving directions
Subway Navigator - A route finder that helps you find your journey via public transport in over 60 cities around the world
The Savvy Traveler – From Minnesota Public Radio come a potpourri of travel stories and information
Tips For Students
Tourism Office Worldwide Directory - Lists over 1400 official government tourism  offices, convention and visitors bureaus, chambers of commerce, and similar agencies which provide free, accurate, and unbiased travel information to the public
Travel Health Online
Travel Links – An eclectic assortment
U.S. Customs - Traveler Information
U.S. Embassies and Consulates Worldwide
USFA Hotel-Motel Master List – A list of properties conforming to The Hotel and Motel Fire Safety Act of 1990 (PL101-391)
U.S. National Park Service
US State Department - Travel Warnings & Consular Information Sheets
What’s Going On.com – Selections from the book “100 Things To Do Before You Die” this site is an eclectic mix of festival, events & destinations
World Time Server - Find the current local time for anywhere in the world