Accessible Europe - Provides accessible accommodations, transports, sightseeings and excursions all over Europe.
Accessible Kiwi Tours - A New Zealand tour company that caters to the disabled and elderly.
Alternative Leisure - Offering a wide variety of trips, cruises and camps from day trips in Boston to vacations in Italy.
Armchair World - A listing of several agencies specializing in travel and vacations for the disabled.
Assistance Travel Service - World wide holidays tailor made to suit specific needs of the less abled and their families.
Breakaway Holidays - Breakaway provides a holiday service for adults with a range of special needs. Offers holidays around the UK and Europe.
Can Be Done - Provides tours and holidays for the less agile and disabled, specializing in European and Canadian trips.
Disability Travel Experts - Holiday planning and booking for worldwide travelers with disabilities.
Disaway - A UK organization offering several pre-planned trips per year.
Handi Travel Services TPI - Specializes in a full selection of travel solutions for people with disabilities.
Travel Outlet - Specializes in travel arrangements for travelers with physical disabilities and anyone desiring slower paced travel,
Trips, Inc. - Offers vacation travel and outings for adults with special needs such as developmental disabilities, mental retardation, or physical handicaps. Online calendar and booking, activity descriptions, and media apperances highlighted. Also provides photographs, chaperone information, and travel links.
Worry Free Travel - Diabetic and disabled travel service agency catering to these folks who want to see the world too.

Site Links
Senior travelers
Travel Agents
Airlines
Cruises
Scooter Hire
Vehicle Rental
Specific Countries
Specific Disabilities
UK Travel

Official reports
Studies & conference proceedings:
Study on Accessibility:

Flight Center
World Airlines Information Index
World Airports Information
World Countries Info
World Sea Ports
World City Tourist Information
European Airlines
Airport Codes
Ferries
Heathrow Departures
North American Airlines
UK Airlines - Airports
UK Coach Operators
Explore Australia
Ski Resorts
Cruises