I found this tip at www.splicker.com

Online Travel Statistics

The Travel Industry Association of America (TIA) released their annual
Travelers' Use of the Internet study in December 2003. The study
shows an increase in the number of people using the internet to
research and book travel.

TIA found that 30% of the adult U.S. population (63.8 million) consult
the web for travel information. These travelers spend (on average) $300
more on travel, and nearly 40% had an annual household income above
$75,000.

Online travelers surf to two or more travel websites, spending an
average of 37 minutes. They research and compare prices, check
schedules and book trips. The number of people actually booking online
increased by 8% over 2002 and grew to 42.2 million people in 2003.
Within this group of online travelers, 32 million people made travel
arrangements exclusively through the internet (a figure expected to
grow according to the TIA).

10 million travelers responded to email campaigns, causing the TIA to
believe that email campaigns are stimulating unplanned travel.

TIA stated that the top 10 travel websites a

Expedia
Travelocity
Orbitz
Yahoo Travel
Cheap Tickets
Hot Wire
VIPfares
Priceline.com
ITN.net
TravelNow.com

If your business supplies lodging, real estate, shopping, recreation,
dining, events or tourist related specialty services, it may be wise to
place advertisements with these websites. If you are not making full
use of the internet for your marketing campaigns you are missing 30% of
your potential market.

As online travelers' habits become more sophisticated you will find
them expecting to find and book everything from one location.